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

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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keywords: +easy
nosy: +bethard
stage:  -> needs patch
type:  -> enhancement

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