PEP 765: add report as appendix

[iritkatriel]

• 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--4125.org.readthedocs.build/pep-0765/

[hugovk]

GitHub top tip:

Fill checkboxes without whitespace.

So instead of:

* [x ] PR title prefixed with PEP number (e.g. ``PEP 123: Summary of changes``)

Rendering as:

• [x ] PR title prefixed with PEP number (e.g. PEP 123: Summary of changes)

This:

* [x] PR title prefixed with PEP number (e.g. ``PEP 123: Summary of changes``)

Renders as:

• PR title prefixed with PEP number (e.g. PEP 123: Summary of changes)

[AlexWaygood]

Looks great!

[ncoghlan]

Good idea to make the PEP a bit more self-contained.