[docs] [issue28951] re.flags not documented in Module Contents as promised.

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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components: +Regular Expressions
nosy: +ezio.melotti, mrabarnett
stage:  -> needs patch
versions: +Python 2.7, Python 3.6, Python 3.7 -Python 3.5

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