[docs] [issue20344] subprocess.check_output() docs misrepresent what shell=True does

[Tuomas Savolainen]

Tuomas Savolainen added the comment:

Created a patch that adds notice of using shell=True and iterable to the documentation. Please do comment if the formatting is wrong (this my first documentation patch).

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Added file: http://bugs.python.org/file34619/documentation20344.patch

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