[docs] [issue40057] Missing mention of some class attributes in socketserver documentation

Change by Cheryl Sabella <cheryl.sabella@gmail.com>: ---------- nosy: +martin.panter versions: +Python 3.10 -Python 3.5, Python 3.6, Python 3.7 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue40057> _______________________________________