[docs] [issue15533] subprocess.Popen(cwd) documentation: Posix vs Windows

[Ned Deily]

Change by Ned Deily <nad at python.org>:


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nosy: +gregory.p.smith
versions: +Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15533>
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