message: Fix a typo in op_hint.py comment
diff: @@ -36,9 +36,7 @@ Example:
  session = tf.Session()
  graphdef_to_convert = tf.lite.convert_op_hints_to_stubs(session)
  - tflite_graph = tf.lite.toco_convert(graphdef_to_convert,
  - [image], [output])
  - [image], [output])
  + tflite_graph = tf.lite.toco_convert(graphdef_to_convert, [image], [output])
  with open("/tmp/graph.fb", "wb") as fp:
  fp.write(tflite_graph)
  