Add a versionadded for PS Core and note that `.venv` is a common virtual environment name.
(cherry picked from commit f9f8e3ce70)
Co-authored-by: Brett Cannon <54418+brettcannon@users.noreply.github.com>
As part of the update, the documentation was updated to normalize
around the term "virtual environment" instead of relying too heavily
on "venv" for the same meaning and leading to inconsistent usage of
either.
Thanks to Steve Piercy for the patch.