[issue13540] Document the Action API in argparse

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4a6b71d8575e by Terry Jan Reedy in branch '3.4':
Issue #13540: add missing markup.
http://hg.python.org/cpython/rev/4a6b71d8575e

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13540>
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