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

[Steve Piercy]

Steve Piercy added the comment:

I've attached a patch for the buildbot error at [library/venv:353].

However, as noted in my [second bullet point](http://bugs.python.org/issue27285#msg269649):

- I removed the file Doc/using/scripts.rst because it became obsolete. This caused warnings in Doc/whatsnew/3.3.rst and Doc/whatsnew/3.4.rst which reference the obsolete file.

I couldn't find a policy that addresses what to do in this situation, so I left it to the council of elders to provide me with their sage guidance. I'll submit a patch as soon as I know which path to follow.

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Added file: http://bugs.python.org/file43681/pyvenv-to-venv.update-susp-ignored.csv.patch

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