message: Updated tf.Session.run(...) documentation
  Added information that order in which `fetches` are evaluated inside the call is undefined.
  Discussion:
diff: @@ -889,6 +889,8 @@ class BaseSession(SessionInterface):
  Either a single value if `fetches` is a single graph element, or
  a list of values if `fetches` is a list, or a dictionary with the
  same keys as `fetches` if that is a dictionary (described above).
  + Order in which `fetches` operations are evaluated inside the call
  + is undefined.
  Raises:
  RuntimeError: If this `Session` is in an invalid state (e.g. has been
  