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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 414f67e000a7 by Brett Cannon in branch 'default':
Issue #27285: Document the deprecation of the pyvenv script.
https://hg.python.org/cpython/rev/414f67e000a7

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nosy: +python-dev

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