[docs] [issue12875] backport re.compile flags default value documentation

[Roundup Robot]

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

New changeset 02e4d3ebbb02 by Eli Bendersky in branch '2.7':
Issue #12875: explicitly specify default value of the optional 'flags' argument to re.* functions. Closes #12875
http://hg.python.org/cpython/rev/02e4d3ebbb02

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nosy: +python-dev

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