[issue13540] Document the Action API in argparse

[paul j3]

paul j3 added the comment:

While we are talking the Action class, the documentation isn't clear that the 'add_argument' method returns an Action object, specifically one the subclasses.  More than once, when answering Stackoverflow questions I've recommended assigning this object to a variable for use later in the script. 

    a = parser.add_argument(...)
    ...
    print a.dest
    a.help = 'change the help'
    a.required = True
    ...

The doc mentions that 'add_subparsers' 'returns a special action object.'

In sum, I think the documentation needs a sentence or two that describe what add_argument returns.  I'm less sure whether it should include an example of using that return.

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