[docs] [issue27285] Deprecate pyvenv in favor of python3 -m venv

[Berker Peksag]

Berker Peksag added the comment:

It's actually deprecated in Python 3.6: https://docs.python.org/dev/whatsnew/3.6.html#deprecated-features

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keywords: +easy
nosy: +berker.peksag
stage:  -> needs patch
versions:  -Python 3.5

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