message: Fix 404 of model file example which was moved to tensorboard repository.
diff: @@ -63,7 +63,7 @@ There are actually two different formats that a ProtoBuf can be saved in.
  TextFormat is a human-readable form, which makes it nice for debugging and
  editing, but can get large when there's numerical data like weights stored in
  it. You can see a small example of that in
  -[graph_run_run2.pbtxt](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tensorboard/demo/data/graph_run_run2.pbtxt).
  +[graph_run_run2.pbtxt](https://github.com/tensorflow/tensorboard/blob/master/tensorboard/demo/data/graph_run_run2.pbtxt).
  Binary format files are a lot smaller than their text equivalents, even though
  they're not as readable for us. In this script, we ask the user to supply a
  