PEP 770: Fix a handful of review comments

[sethmlarson]

• Change is either:
  • To a Draft PEP
  • To an Accepted or Final PEP, with Steering Council approval
  • To fix an editorial issue (markup, typo, link, header, etc)
• PR title prefixed with PEP number (e.g. PEP 123: Summary of changes)

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📚 Documentation preview 📚: https://pep-previews--4366.org.readthedocs.build/

[hugovk]

Don't forget to update line 7!

https://github.com/python/peps/blob/main/.github/PULL_REQUEST_TEMPLATE/Mark%20a%20PEP%20as%20Accepted%20or%20Rejected.md

[brettcannon]

Don't forget to update line 7!

This was the required PR for acceptance, so it wasn't forgotten. 😁