Fix typo -- missing "not" (GH-5528)

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Raymond Hettinger 2018-02-04 09:15:01 -08:00 committed by GitHub
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@ -514,7 +514,7 @@ or subtracting from an empty counter.
Rotate the deque *n* steps to the right. If *n* is negative, rotate
to the left.
When the deque is empty, rotating one step to the right is equivalent
When the deque is not empty, rotating one step to the right is equivalent
to ``d.appendleft(d.pop())``, and rotating one step to the left is
equivalent to ``d.append(d.popleft())``.