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

[Brett Cannon]

Brett Cannon added the comment:

Chris' patch, though, fixes a doc that fails to mention our support policy for Windows: https://www.python.org/dev/peps/pep-0011/#microsoft-windows . There should at least be a sentence saying that once Microsoft no longer supports an operating system release then Python also drops support and link to PEP 11 to the full explanation.

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nosy: +brett.cannon
resolution: not a bug -> 
status: closed -> open

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