[docs] [issue31640] Document exit() from parse_args

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I think this is reasonable, but do note that this is covered in 16.4.4.2, and the fact that help exits is actually a property of help, not parse_args.  That is, the docs are correct and complete as they stand, but I agree that it would be helpful to have the summary include this information as well.

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nosy: +r.david.murray
versions: +Python 2.7 -Python 3.5, Python 3.6

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