[issue22317] action argument is not documented in argparse add_subparser() docs

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +paul.j3
versions: +Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22317>
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