[MRG] DOC removed redundant word from KNN docs (scikit-learn#7345)

Author: kjacks21

sklearn/neighbors/classification.py

@@ -108,7 +108,7 @@ class KNeighborsClassifier(NeighborsBase, KNeighborsMixin,
     .. warning::
 
        Regarding the Nearest Neighbors algorithms, if it is found that two
-       neighbors, neighbor `k+1` and `k`, have identical distances but
+       neighbors, neighbor `k+1` and `k`, have identical distances
        but different labels, the results will depend on the ordering of the
        training data.