[docs] [issue18790] incorrect text in argparse add_help example

[Michael Bikovitsky]

Changes by Michael Bikovitsky <moshe.biko at gmail.com>:


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keywords: +patch
Added file: http://bugs.python.org/file31393/doc_fix.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18790>
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