[docs] [issue20265] Bring Doc/using/windows up to date

[Zachary Ware]

Zachary Ware added the comment:

The plan is to eventually have enough time to pick through the file and make sure everything is actually up to date :).

>From just a quick glance, here's a couple of the things that still need to be done:
- all of the external links should be checked for whether they are up to date (and still relevant to current Python)
- the 'Excursus: Setting environment variables' section needs a major overhaul ('autoexec.bat' isn't used (or at least not recommended) anymore, among other things)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20265>
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