[docs] [issue22394] Update documentation building to use venv and pip

Roundup Robot added the comment: New changeset 888103600e72 by Brett Cannon in branch 'default': Issue #22394: Add a 'venv' command to Doc/Makefile. https://hg.python.org/cpython/rev/888103600e72 ---------- nosy: +python-dev _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue22394> _______________________________________