PEP 12 & 1: Add a Change History section

[warsaw]

For PEP 694, I've found it very helpful to add a Change History section, which makes it easier for readers to understand the evolution of a PEP, especially complex ones. I think it's so useful, I'm proposing we officially add this to the PEP templates, although optionally. PEP authors can decide whether it's helpful or not, but if they do, a standard format is recommended.

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📚 Documentation preview 📚: https://pep-previews--4801.org.readthedocs.build/

[cdce8p]

It might also make sense to update the PR template then.

peps/.github/PULL_REQUEST_TEMPLATE/Add a new PEP.md

Lines 30 to 39 in 0d2bacb

	* [ ] [Suggested sections](https://peps.python.org/pep-0012/#suggested-sections) included (unless not applicable)
	* [ ] Motivation
	* [ ] Rationale
	* [ ] Specification
	* [ ] Backwards Compatibility
	* [ ] Security Implications
	* [ ] How to Teach This
	* [ ] Reference Implementation
	* [ ] Rejected Ideas
	* [ ] Open Issues

[warsaw]

It might also make sense to update the PR template then.

Thanks, great suggestion! I noticed a few other section headers missing so have now added those too (plus a spelling fix).