[docs] [issue459007] Document sys.path on Windows

[Mark Hammond]

Mark Hammond <mhammond at users.sourceforge.net> added the comment:

FWIW, I think the rules are fairly well explained in the comments in PC/getpathp.c; last time I looked at this, the only thing I couldn't really decide was where in the official docs these comments should be put (after reformatting and minor rewording etc)

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