gh-112730: Update docs for colour env vars by hugovk · Pull Request #112837 · python/cpython

• Make "Controlling color" header in sentence case to match others:

• Link from the env var and what's new sections to the most descriptive "Controlling color" section.

• Also add the env var description to python.man so it shows in the man pages.

(I spotted the note at the top of cmdline.rst saying "You probably should update Misc/python.man, too, if you modify this file". There's a few other missing env vars to fill in.)

• Issue: Use color to highlight error locations #112730

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