forgot whitespace

Author: BenFradet

examples/src/main/python/ml/index_to_string_example.py

@@ -29,7 +29,7 @@
 
     # $example on$
     df = sqlContext.createDataFrame(
-        [(0, "a"), (1, "b"), (2, "c"), (3, "a"), (4, "a"), (5, "c") ],
+        [(0, "a"), (1, "b"), (2, "c"), (3, "a"), (4, "a"), (5, "c")],
         ["id", "category"])
 
     stringIndexer = StringIndexer(inputCol="category", outputCol="categoryIndex")