[docs] [issue27877] Add recipe for "valueless" Enums to docs

[Ethan Furman]

Ethan Furman added the comment:

New changeset 871bdb06c1cf by Ethan Furman in branch 'default':
add recipes for pseudo-valueless enums
https://hg.python.org/cpython/rev/871bdb06c1cf

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<http://bugs.python.org/issue27877>
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