add `{git,svn}diff{,view}` man pages links

[BrianInglis]

add {git,svn}diff{,view} man pages links;
could either be:

• patchview.1 symlinks to {git,svn}diff{,view}.1
  or
• {git,svn}diff{,view}.1 contents .so patchview.1

[sergiomb2]

Hi, We need also add gitshow{,view}.1
and update patchview.1 .
I will try find some time to do one PR
Thank you

[BrianInglis]

Cheers - thanks folks! ;^>

[twaugh]

Thanks @sergiomb2

[twaugh]

@sergiomb2 want me to do this? What updates does patchview.1 need?

[sergiomb2]

Yes, I've been very busy and tired lately.

We need to add symbolic links gitshow{,view}.1 to the man pages, and update the man page with the new text from [1] https://github.com/twaugh/patchutils/blob/master/patchview/README.patchview

Anyway, my English is horrible, so please feel free to also improve README.patchview

I currently use ChatGPT to help me translate some text into English, so maybe I should reword README.patchview with ChatGPT's help

Thank you

[1]
65f9c46