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

[Mike Short]

Mike Short added the comment:

I am uploading patches for both 2.7 as well as latest (3.x).  I only added the action verbiage itself in, but would it be beneficial to also add in links to more detailed descriptions similar to what is done in ArgumentParser.add_argument earlier in the argparse page?

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keywords: +patch
Added file: http://bugs.python.org/file37115/argparse.patch

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