docs: fix some broken links

[purarue]

No description provided.

[purarue]

hm, mac CI doesnt have access to one of the CLI flags I guess?

diff: unrecognized option `--new-line-format='

dont know if this is a CI issue or a change in the diff CLI flags on mac, dont have a machine I can test on right now

[karlicoss]

Yeah, thanks Apple, doesn't even spare a version number 🙄
Gonna take a look, I guess most likely it would require GNU diff from brew

bash-3.2$ diff --version
Apple diff (based on FreeBSD diff)

[purarue]

yeah, iirc when I used to use a mac could install coreutils and those are prefixed with g, like gdiff:

Commands also provided by macOS and the commands dir, dircolors, vdir have been installed with the prefix "g".
If you need to use these commands with their normal names, you can add a "gnubin" directory to your PATH with:
    PATH="$HOMEBREW_PREFIX/opt/coreutils/libexec/gnubin:$PATH"