PEP 814: Minor tweaks

[vstinner]

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📚 Documentation preview 📚: https://pep-previews--4703.org.readthedocs.build/pep-0814/

[encukou]

You might also want to add a note to Construction that you can do frozendict(collection, **additional_kwargs).

[vstinner]

@corona10: Would you mind to review these changes?

[corona10]

lgtm!

[efimov-mikhail]

There's a typo frozencopy.copy() -> frozendict.copy().
CC @vstinner

I can make a PR with this "one line change", if you want to.

[vstinner]

There's a typo frozencopy.copy() -> frozendict.copy().

Oops. I wrote #4708 to prepare the next batch of changes :-) I fixed the typo there. Thanks for reporting the typo.