[issue20848] 3.4 cherry-pick: b637064cc696 Improve enum subclass behavior

[Ethan Furman]

Ethan Furman added the comment:

Ah, thanks!  Docs are built, fixed, and built again.

Larry, the two cherries to pick for this are:

b637064cc696: bulk of doc changes
54ab95407288: fixes for ReST markup

Thanks.

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