PEP 751: close open issues

[brettcannon]

• 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--4251.org.readthedocs.build/

[willingc]

Thank you @brettcannon. I appreciate the time and effort that you put into making this clear to read. Flagged a few nits.