[docs] [issue22261] Document how to use Concurrent Build when using MsBuild

[Zachary Ware]

Zachary Ware added the comment:

I finally made it back to this and committed a tweaked version of your patch.  Thanks for the report and patch!

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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22261>
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