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

[Mark Dickinson]

Mark Dickinson added the comment:

In any case, the patch only gives half of the correction.  The corrected test would have to be "if *those* data are needed later" rather than "if that data are needed later".

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nosy: +mark.dickinson

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