[docs] [issue13540] Document the Action API in argparse

[Jason R. Coombs]

Jason R. Coombs added the comment:

I've tried building the docs, but it appears to rely on a local build of Python as well as subversion, neither of which my system can do currently, so I'm hoping someone has a suitable environment to help test the building of the docs.

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<http://bugs.python.org/issue13540>
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