[docs] [issue14804] Wrong defaults args notation in docs

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset a36666c52115 by Hynek Schlawack in branch '2.7':
#14804: Remove [] around optional arguments with default values
http://hg.python.org/cpython/rev/a36666c52115

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