[docs] [issue32553] Use the py launcher in venv Windows examples

Change by Eryk Sun <eryksun@gmail.com>: ---------- title: venv says to use python3 which does not exist in 3.6.4 -> Use the py launcher in venv Windows examples versions: +Python 3.10, Python 3.8, Python 3.9 -Python 3.6 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue32553> _______________________________________