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

[paul j3]

paul j3 added the comment:

You need line continuation characters '\'


.. class:: Action(option_strings, dest, nargs=None, const=None, default=None, \
                  type=None, choices=None, required=False, help=None, \
                  metavar=None)

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