fix pep8

Author: charlesdong1991

pandas/io/formats/csvs.py

@@ -234,7 +234,7 @@ def _save_header(self):
         has_aliases = isinstance(header, (tuple, list, np.ndarray,
                                           ABCIndexClass))
         if not (has_aliases or header):
-            # if index_label is False, no index name and label will be displayed
+            # if index_label and header are False, nothing will display
             if index_label is False:
                 return
             else: