[docs] [issue28130] Document that time.tzset updates time module globals

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Committed in ec3b08b361c0.  Thanks, Greg.

Leaving open until 2.7 docs are fixed as well.

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resolution:  -> fixed
stage:  -> resolved
versions: +Python 2.7 -Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28130>
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