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

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

I have converted the Doc/library/re.rst doc of 2.7 to follow the new convention of 3.x, patch attached.

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keywords: +patch
Added file: http://bugs.python.org/file23668/issue12875.1.patch

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