[docs] Small error in argparse documentation

[John Kooker]

Hey Python docs team,

I think I may have found a small error in the docs. The last example in the
argparse add_help section doesn't look correct. The dashes should be plus
signs.

http://docs.python.org/dev/library/argparse.html#add-help

Thanks for all your hard work! These docs are fantastic.

--john
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