[docs] [issue27518] small typo error in Grammar/Grammar

[Roundup Robot]

Roundup Robot added the comment:

New changeset db5a5679a9de by Berker Peksag in branch '3.5':
Issue #27518: Fix typo in Grammar/Grammar
https://hg.python.org/cpython/rev/db5a5679a9de

New changeset bae0d7389e96 by Berker Peksag in branch 'default':
Issue #27518: Merge from 3.5
https://hg.python.org/cpython/rev/bae0d7389e96

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nosy: +python-dev

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<http://bugs.python.org/issue27518>
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