PEP 788: Address feedback from second round

[ZeroIntensity]

• 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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• Add a PyThreadRef parameter to PyThreadState_Ensure and PyThreadState_Release.
• Rename the PEP to "Interpreter References", alongside removing the (confusing) usage of "native thread". I think this is a good short and sweet title, something like "Attaching Thread States via Interpreter References" felt too long and redundant to me.

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📚 Documentation preview 📚: https://pep-previews--4478.org.readthedocs.build/pep-0788/

[ZeroIntensity]

I'm going to merge this tomorrow if there aren't any objections (particularly to the new title).

[encukou]

None from me! Sorry for the delay.