[docs] [issue27285] Document the deprecation of pyvenv in favor of `python3 -m venv`

[Brett Cannon]

Brett Cannon added the comment:

Thanks for the patch, Steve! I went ahead and got this done now when I realized your patch touched so many files, thus waiting could lead to skew and the need to update the patch needlessly.

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

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<http://bugs.python.org/issue27285>
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