[docs] [issue25874] Add notice that XP is not supported on Python 3.5+

[Brett Cannon]

Brett Cannon added the comment:

The "Using Python on Windows" doc has been updated. Thanks, Chris (who got added to ACKS)!

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resolution:  -> fixed
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25874>
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