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

[Jason R. Coombs]

Jason R. Coombs added the comment:

I've made another commit to capture Steven's recommendations. I've also merged the work with the latest 2.7 tip, the result of which is the latest diff. I'll commit this in a week or two if there aren't any objections, though I would appreciate a review and especially any suggestions on how I might test the correctness of the syntax.

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