[docs] [issue35026] Winreg's documentation lacks mentioning required permission at some points

Change by Eryk Sun <eryksun@gmail.com>: ---------- versions: +Python 3.10, Python 3.8, Python 3.9 -Python 3.7 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue35026> _______________________________________