Review comment: s/SQL DML/DML/.

Author: tseaver

spanner/google/cloud/spanner_v1/database.py

@@ -284,7 +284,7 @@ def execute_partitioned_dml(
         """Execute a partitionable DML statement.
 
         :type dml: str
-        :param dml: SQL DML statement
+        :param dml: DML statement
 
         :type params: dict, {str -> column value}
         :param params: values for parameter replacement.  Keys must match