Fix markdownlint issues

[xtqqczze]

Enable the rules disabled in #4995

• Exclude eng/common since these files are from https://github.com/dotnet/arcade.
• Add a <!-- markdownlint-disable --> directive for files in reports/net9to10/
• Fix MD059/descriptive-link-text : Link text should be descriptive
• Fix MD047/single-trailing-newline : Files should end with a single newline character

Fix #4996

[Copilot]

Pull request overview

This PR re-enables previously disabled markdownlint rules and updates Markdown content/configuration to bring the repo back into compliance, while excluding Arcade-sourced Markdown and suppressing linting for generated net9→10 report files.

Changes:

• Re-enabled multiple markdownlint rules in .markdownlint.jsonc and updated the GitHub Actions workflow to use an ignore file.
• Added .markdownlintignore (excluding eng/common/) and added <!-- markdownlint-disable --> to generated reports/net9to10/*_report.md files.
• Fixed MD059 (descriptive link text) and MD047 (single trailing newline) violations across several docs/reports.

Reviewed changes

Copilot reviewed 20 out of 21 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/benchmarks/gc/GC.Infrastructure/README.md	Updates link text to satisfy MD059; minor wording tweaks.
src/benchmarks/gc/GC.Infrastructure/Notebooks/README.md	Makes link text descriptive for MD059 compliance.
docs/benchmarkdotnet.md	Makes link text descriptive for MD059 compliance.
reports/net9to10/README.md	Fixes formatting/newline consistency for lint compliance.
reports/net9to10/*_report.md	Adds markdownlint-disable directives and fixes trailing-newline/formatting issues in generated reports.
.markdownlintignore	Introduces ignore list (notably eng/common/).
.markdownlint.jsonc	Re-enables previously-disabled rules (MD001/MD012/MD031/MD033/MD036/MD047/MD051/MD052/MD059).
.github/workflows/markdownlint.yml	Uses .markdownlintignore via --ignore-path when running markdownlint.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

This change removes the in-doc anchor link that previously navigated readers to the relevant section. To keep the document easy to navigate while satisfying MD059, consider linking directly with descriptive text (e.g., a link to the “How To Add New Benchmarks” section) instead of referring to “the next section” without a link.

Suggested change

	2. The Base CommandLine is the base crank command that's run. More details about how to appropriately set this can be found in the next section.
	2. The Base CommandLine is the base crank command that's run. More details about how to appropriately set this can be found in the [How To Add New Benchmarks](#how-to-add-new-benchmarks) section.

[Copilot]

Since the workflow now relies on --ignore-path ./.markdownlintignore, consider adding .markdownlintignore to the on.pull_request.paths filter so updates to the ignore list will also trigger this workflow (otherwise changes to the ignore file alone won’t be validated).

[LoopedBard3]

Looks good, thanks!