[docs] [issue14191] argparse doesn't allow optionals within positionals

[R. David Murray]

R. David Murray added the comment:

I got an offline agreement from Zach Ware, and nobody here at the sprint has objected (though I don't know if anyone else looked), so I'll go ahead and finish the PR.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14191>
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