Adds a new 'Pip not installed' section that covers
running `ensurepip` manually, and also references
the relevant section of the Python Packaging User
Guide.
(cherry picked from commit b3527bfefd)
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.
Nicholas
Brett Cannon
Georg Brandl
Senthil Kumaran
Nick Coghlan
Larry Hastings