[docs] [issue27385] itertools.groupby has misleading doc string

[Ned Deily]

Changes by Ned Deily <nad at python.org>:


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nosy: +rhettinger
stage:  -> patch review
versions:  -Python 3.2, Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27385>
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