[docs] [issue20677] Minor typo in enum docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 569589d3abb5 by Ezio Melotti in branch 'default':
#20677: fix typo in enum docs.  Patch by Saimadhav Heblikar.
http://hg.python.org/cpython/rev/569589d3abb5

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nosy: +python-dev

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