Improve documenation about num_params in sqlite3 create_function and create_aggregate

[cedk]

BPO	23758
Nosy	@cedk, @berkerpeksag
Files	sqlite3_doc.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-03-27.19:39:33.112>
created_at = <Date 2015-03-24.09:44:55.013>
labels = ['type-feature', 'docs']
title = 'Improve documenation about num_params in sqlite3 create_function and create_aggregate'
updated_at = <Date 2016-03-27.19:39:33.110>
user = 'https://github.com/cedk'

bugs.python.org fields:

activity = <Date 2016-03-27.19:39:33.110>
actor = 'berker.peksag'
assignee = 'docs@python'
closed = True
closed_date = <Date 2016-03-27.19:39:33.112>
closer = 'berker.peksag'
components = ['Documentation']
creation = <Date 2015-03-24.09:44:55.013>
creator = 'ced'
dependencies = []
files = ['38664']
hgrepos = []
issue_num = 23758
keywords = ['patch']
message_count = 3.0
messages = ['239104', '262531', '262532']
nosy_count = 5.0
nosy_names = ['ghaering', 'ced', 'docs@python', 'python-dev', 'berker.peksag']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23758'
versions = ['Python 3.5', 'Python 3.6']

[cedk]

num_params must have the value -1 for any number of arguments see https://www.sqlite.org/c3ref/create_function.html

[python-dev]

New changeset 02efd708c5c0 by Berker Peksag in branch '3.5':
Issue bpo-23758: Improve num_params docs of create_{function,aggregate} functions
https://hg.python.org/cpython/rev/02efd708c5c0

New changeset 5be12f20d8f2 by Berker Peksag in branch 'default':
Issue bpo-23758: Improve num_params docs of create_{function,aggregate} functions
https://hg.python.org/cpython/rev/5be12f20d8f2

[berkerpeksag]

Thank you Cédric. I also added tests to verify the behavior of num_params=-1.