fix typo

Author: yinxusen

python/pyspark/ml/classification.py

@@ -1344,8 +1344,8 @@ def _transform(self, dataset):
     def copy(self, extra=None):
         """
         Creates a copy of this instance with a randomly generated uid
-        and some extra params. This copies creates a deep copy of
-        the embedded paramMap, and copies the embedded and extra parameters over.
+        and some extra params. This creates a deep copy of the embedded paramMap,
+        and copies the embedded and extra parameters over.
 
         :param extra: Extra parameters to copy to the new instance
         :return: Copy of this instance