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

[Brett Cannon]

Brett Cannon added the comment:

Basically I changed my mind about adding the code deprecation in 3.5.1 since it wasn't fair to people to run into that in a bugfix release. Documenting the deprecation, though, can happen in Python 3.5.1 as well as updating the documentation of the venv module to only use `python3 -m venv` which I missed the first time through.

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assignee: docs at python -> brett.cannon
title: Deprecate pyvenv in favor of python3 -m venv -> Document the deprecation of pyvenv in favor of `python3 -m venv`

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27285>
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