Port System.IO documentation for .NET 8.0 APIs

Below is the list of APIs that still show up as undocumented in dotnet-api-docs and were introduced in .NET 8.0.

Full porting instructions can be found in the [main issue](https://github.com/dotnet/runtime/issues/88561).

This task needs to be finished before the RC2 snap (September 18th).

| Summary  | Parameters | TypeParameters | ReturnValue | API                                                                                                                                                                                                                                                                                                                                               |
|----------|------------|----------------|-------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Missing  | Missing    | NA             | Missing     | [M:System.IO.StreamWriter.FlushAsync(System.Threading.CancellationToken)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO/StreamWriter.xml)                                                                                                                                                                                     |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.TextWriter.FlushAsync(System.Threading.CancellationToken)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO/TextWriter.xml)                                                                                                                                                                                         |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.Crc32.GetCurrentHashAsUInt32](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/Crc32.xml)                                                                                                                                                                                                           |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.Crc32.HashToUInt32(System.ReadOnlySpan{System.Byte})](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/Crc32.xml)                                                                                                                                                                                   |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.Crc64.GetCurrentHashAsUInt64](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/Crc64.xml)                                                                                                                                                                                                           |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.Crc64.HashToUInt64(System.ReadOnlySpan{System.Byte})](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/Crc64.xml)                                                                                                                                                                                   |
| Missing  | NA         | NA             | NA          | [M:System.IO.Hashing.XxHash128.#ctor](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                                    |
| Missing  | Missing    | NA             | NA          | [M:System.IO.Hashing.XxHash128.#ctor(System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                      |
| Missing  | Missing    | NA             | NA          | [M:System.IO.Hashing.XxHash128.Append(System.ReadOnlySpan{System.Byte})](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                 |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.XxHash128.GetCurrentHashAsUInt128](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                  |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.Hash(System.Byte[])](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                      |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.Hash(System.Byte[],System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                         |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.Hash(System.ReadOnlySpan{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                      |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.Hash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                             |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.HashToUInt128(System.ReadOnlySpan{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                             |
| Missing  | NA         | NA             | NA          | [M:System.IO.Hashing.XxHash128.Reset](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                                    |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash128.TryHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int32@,System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                            |
| Missing  | NA         | NA             | NA          | [T:System.IO.Hashing.XxHash128](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash128.xml)                                                                                                                                                                                                                          |
| Missing  | NA         | NA             | NA          | [M:System.IO.Hashing.XxHash3.#ctor](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                                        |
| Missing  | Missing    | NA             | NA          | [M:System.IO.Hashing.XxHash3.#ctor(System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                          |
| Missing  | Missing    | NA             | NA          | [M:System.IO.Hashing.XxHash3.Append(System.ReadOnlySpan{System.Byte})](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                     |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.XxHash3.GetCurrentHashAsUInt64](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                       |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.Hash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                 |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.Hash(System.ReadOnlySpan{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                          |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.Hash(System.Byte[])](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                          |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.Hash(System.Byte[],System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                             |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.HashToUInt64(System.ReadOnlySpan{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                  |
| Missing  | NA         | NA             | NA          | [M:System.IO.Hashing.XxHash3.Reset](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                                        |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash3.TryHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int32@,System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                |
| Missing  | NA         | NA             | NA          | [T:System.IO.Hashing.XxHash3](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash3.xml)                                                                                                                                                                                                                              |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.XxHash32.GetCurrentHashAsUInt32](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash32.xml)                                                                                                                                                                                                     |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash32.HashToUInt32(System.ReadOnlySpan{System.Byte},System.Int32)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash32.xml)                                                                                                                                                                |
| Missing  | NA         | NA             | Missing     | [M:System.IO.Hashing.XxHash64.GetCurrentHashAsUInt64](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash64.xml)                                                                                                                                                                                                     |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.Hashing.XxHash64.HashToUInt64(System.ReadOnlySpan{System.Byte},System.Int64)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.Hashing/XxHash64.xml)                                                                                                                                                                |
| Missing  | Missing    | NA             | Missing     | [M:System.IO.MemoryMappedFiles.MemoryMappedFile.CreateFromFile(Microsoft.Win32.SafeHandles.SafeFileHandle,System.String,System.Int64,System.IO.MemoryMappedFiles.MemoryMappedFileAccess,System.IO.HandleInheritability,System.Boolean)](https://github.com/dotnet/dotnet-api-docs/blob/main/xml/System.IO.MemoryMappedFiles/MemoryMappedFile.xml) |

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Uh oh!

Port System.IO documentation for .NET 8.0 APIs #88568

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Summary	Parameters	TypeParameters	ReturnValue	API
Missing	Missing	NA	Missing	M:System.IO.StreamWriter.FlushAsync(System.Threading.CancellationToken)
Missing	Missing	NA	Missing	M:System.IO.TextWriter.FlushAsync(System.Threading.CancellationToken)
Missing	NA	NA	Missing	M:System.IO.Hashing.Crc32.GetCurrentHashAsUInt32
Missing	Missing	NA	Missing	M:System.IO.Hashing.Crc32.HashToUInt32(System.ReadOnlySpan{System.Byte})
Missing	NA	NA	Missing	M:System.IO.Hashing.Crc64.GetCurrentHashAsUInt64
Missing	Missing	NA	Missing	M:System.IO.Hashing.Crc64.HashToUInt64(System.ReadOnlySpan{System.Byte})
Missing	NA	NA	NA	M:System.IO.Hashing.XxHash128.#ctor
Missing	Missing	NA	NA	M:System.IO.Hashing.XxHash128.#ctor(System.Int64)
Missing	Missing	NA	NA	M:System.IO.Hashing.XxHash128.Append(System.ReadOnlySpan{System.Byte})
Missing	NA	NA	Missing	M:System.IO.Hashing.XxHash128.GetCurrentHashAsUInt128
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.Hash(System.Byte[])
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.Hash(System.Byte[],System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.Hash(System.ReadOnlySpan{System.Byte},System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.Hash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.HashToUInt128(System.ReadOnlySpan{System.Byte},System.Int64)
Missing	NA	NA	NA	M:System.IO.Hashing.XxHash128.Reset
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash128.TryHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int32@,System.Int64)
Missing	NA	NA	NA	T:System.IO.Hashing.XxHash128
Missing	NA	NA	NA	M:System.IO.Hashing.XxHash3.#ctor
Missing	Missing	NA	NA	M:System.IO.Hashing.XxHash3.#ctor(System.Int64)
Missing	Missing	NA	NA	M:System.IO.Hashing.XxHash3.Append(System.ReadOnlySpan{System.Byte})
Missing	NA	NA	Missing	M:System.IO.Hashing.XxHash3.GetCurrentHashAsUInt64
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.Hash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.Hash(System.ReadOnlySpan{System.Byte},System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.Hash(System.Byte[])
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.Hash(System.Byte[],System.Int64)
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.HashToUInt64(System.ReadOnlySpan{System.Byte},System.Int64)
Missing	NA	NA	NA	M:System.IO.Hashing.XxHash3.Reset
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash3.TryHash(System.ReadOnlySpan{System.Byte},System.Span{System.Byte},System.Int32@,System.Int64)
Missing	NA	NA	NA	T:System.IO.Hashing.XxHash3
Missing	NA	NA	Missing	M:System.IO.Hashing.XxHash32.GetCurrentHashAsUInt32
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash32.HashToUInt32(System.ReadOnlySpan{System.Byte},System.Int32)
Missing	NA	NA	Missing	M:System.IO.Hashing.XxHash64.GetCurrentHashAsUInt64
Missing	Missing	NA	Missing	M:System.IO.Hashing.XxHash64.HashToUInt64(System.ReadOnlySpan{System.Byte},System.Int64)
Missing	Missing	NA	Missing	M:System.IO.MemoryMappedFiles.MemoryMappedFile.CreateFromFile(Microsoft.Win32.SafeHandles.SafeFileHandle,System.String,System.Int64,System.IO.MemoryMappedFiles.MemoryMappedFileAccess,System.IO.HandleInheritability,System.Boolean)

Uh oh!

Port System.IO documentation for .NET 8.0 APIs #88568

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