[docs] [issue17947] Code, test, and doc review for PEP-0435 Enum

[Ethan Furman]

Ethan Furman added the comment:

Doc updates are in.

I removed the 'unique, constant' from the first line of the intro, as neither of those things are necessarily true.

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Added file: http://bugs.python.org/file30511/pep-0435.10.stoneleaf.patch

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