message: Minor description fix.
diff: @@ -1001,7 +1001,7 @@ class ClusterCoordinator(object):
  This method is non-blocking in that it queues the `fn` which will be
  executed later and returns a
  `tf.distribute.experimental.coordinator.RemoteValue` object immediately.
  - `fetch` can be called on the it to wait for the function execution to finish
  + `fetch` can be called on it to wait for the function execution to finish
  and retrieve its output from a remote worker. On the other hand, call
  `tf.distribute.experimental.coordinator.ClusterCoordinator.join` to wait for
  all scheduled functions to finish.
  