[docs] [issue21078] multiprocessing.managers.BaseManager.__init__'s "serializer" argument is not documented

Change by Irit Katriel <iritkatriel@yahoo.com>: ---------- components: +Library (Lib) type: -> behavior versions: +Python 3.10, Python 3.8, Python 3.9 -Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue21078> _______________________________________