[docs] [issue18245] In itertools.groupby() make data plural

[R. David Murray]

R. David Murray added the comment:

Yes, the way it is now is normal written english, regardless of what any older official stylebooks may say :)

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nosy: +r.david.murray
resolution:  -> invalid
stage:  -> committed/rejected
status: open -> closed
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18245>
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