[docs] [issue18220] In itertools.islice() make prototype like in help()

[py.user]

Changes by py.user <bugzilla-mail-box at yandex.ru>:


Removed file: http://bugs.python.org/file30599/issue18220.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18220>
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