use Vale to fix small typos and spelling errors

[zuchka]

This PR includes 60+ small changes to the docs. Most are for small typos, spelling errors, or slight changes to the spelling/capitalization of proper names.

I used Vale to find these as a test. Figured I would fix them and submit while I was at it :)

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[zuchka]

wooo! pausing this PR for now until Melissa merges her overhaul