[docs] [issue23758] Improve documenation about num_params in sqlite3 create_function and create_aggregate

Changes by Berker Peksag <berker.peksag@gmail.com>: ---------- nosy: +berker.peksag, ghaering stage: -> patch review versions: +Python 3.4, Python 3.5 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue23758> _______________________________________