[issue13540] Document the Action API in argparse

[paul j3]

paul j3 added the comment:

The formatting of the descriptor line for this class is not consistent with the classes for this module.

It lacks 'class'.

It is all bold

In contrast 

    class argparse.ArgumentParser(prog=None, ...

uses bold for only the name.

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