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

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +berker.peksag, ghaering
stage:  -> patch review
versions: +Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23758>
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