[docs] [issue22997] Minor improvements to "Functional API" section of Enum documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 522d13d8e76e by Ethan Furman in branch '3.4':
Issue22997: minor doc update; thanks to Simoen Visser
https://hg.python.org/cpython/rev/522d13d8e76e

New changeset 31ae2dcaaed8 by Ethan Furman in branch 'default':
Issue22997: minor doc update; thanks to Simoen Visser
https://hg.python.org/cpython/rev/31ae2dcaaed8

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nosy: +python-dev

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<http://bugs.python.org/issue22997>
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