[docs] [issue18301] In itertools.chain.from_iterable() there is no cls argument

[Roundup Robot]

Roundup Robot added the comment:

New changeset 29fa1f418796 by Raymond Hettinger in branch '3.3':
Issue 18301:  The classmethod decorator didn't fit well with the rough-equivalent example code.
http://hg.python.org/cpython/rev/29fa1f418796

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18301>
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