message: Add docstring pointing to tf.contrib.quantize.
diff: @@ -56,6 +56,11 @@ PyObject* DoQuantizeTrainingOnGraphDefHelper(
  %insert("python") %{
  def do_quantize_training_on_graphdef(input_graph, num_bits):
  + """A general quantization scheme is being developed in @{tf.contrib.quantize}.
  +
  + Consider using that instead, though since it is in the tf.contrib namespace,
  + it is not subject to backward compatibility guarantees.
  + """
  from tensorflow.core.framework.graph_pb2 import GraphDef
  from tensorflow.python.framework import errors
  with errors.raise_exception_on_not_ok_status() as status:
  