Maintainer-Guidelines: basic touch-up
Maintainer-Guidelines: basic touch-up

* Moved the `pip` homepage to something that points more directly at
`pip`.
* Adds a note on `test do`. All the maintainers and the bot check the
existence of such things these days, but I guess if anyone stumbles
across the document it’s useful to say.
* GiX is formally dead, and has two blessed forks.
* Typo on contributor.

Closes Homebrew/homebrew#35467.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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