message: Fix type in docstring for tf.saved_model.load().
diff: @@ -528,7 +528,7 @@ def load(export_dir, tags=None):
  export_dir: The SavedModel directory to load from.
  tags: A tag or sequence of tags identifying the MetaGraph to load. Optional
  if the SavedModel contains a single MetaGraph, as for those exported from
  - `tf.saved_model.load`.
  + `tf.saved_model.save`.
  Returns:
  A trackable object with a `signatures` attribute mapping from signature
  