[docs] [issue19023] ctypes docs: Unimplemented and undocumented features

Changes by Berker Peksag <berker.peksag@gmail.com>: ---------- nosy: +amaury.forgeotdarc, belopolsky, meador.inge _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue19023> _______________________________________