[issue9299] os.makedirs(): Add a keyword argument to suppress "File exists" exception

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

> Doc review: Small typo, Flase vs False.  Also, exceptions are "raised" rather than "thrown" in Python land (same for the docstring).  Both exception references should be :exc:`OSError`.

Here fixed these doc problems. Thanks for reviewing! Besides, the reason why I use "throw" rather than "raise" is that I found current Doc use "throw an exception", so I think an exception is "thrown". ^_^

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Added file: http://bugs.python.org/file18338/mkdir.diff

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