docs: misc cleanups

Erik Faye-Lund requested to merge kusma/mesa:docs-misc-fixes into main

Here's another round of misc cleanups to the docs.

It's mostly about consistency and avoiding needless jargon, but also has a few corrections and other updates in there.

It's a bit all over the place, but I felt like splitting this up in a bunch of MRs would just be messier.

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