message: Update the docstring wrt get_config behavior for the returned dict.
diff: @@ -676,6 +676,10 @@ class Layer(module.Module, version_utils.LayerVersionSelector):
  information, nor the layer class name. These are handled
  by `Network` (one layer of abstraction above).
  + Note that `get_config()` does not guarantee to return a fresh copy of dict
  + every time it is called. The callers should make a copy of the returned dict
  + if they want to modify it.
  +
  Returns:
  Python dictionary.
  """
  