[1.5.x] Fixed a minor spelling mistake in the queryset documentation

Backport of d258cce482 from master

docs/ref/models/querysets.txt

@@ -1451,7 +1451,7 @@ internally so that repeated evaluations do not result in additional queries. In
 contrast, ``iterator()`` will read results directly, without doing any caching
 at the ``QuerySet`` level (internally, the default iterator calls ``iterator()``
 and caches the return value). For a ``QuerySet`` which returns a large number of
-objects that you only need to access once, this can results in better
+objects that you only need to access once, this can result in better
 performance and a significant reduction in memory.
 
 Note that using ``iterator()`` on a ``QuerySet`` which has already been