message: Fix documentation of ready_for_local_init_op in tf.Supervisor, which mentions incorrect default value.
diff: @@ -243,9 +243,8 @@ class Supervisor(object):
  supervisors in `prepare_or_wait_for_session()` to check if the model is
  ready to run the local_init_op.
  The model is considered ready if it returns an empty array. Defaults to
  - the tensor returned from
  - `tf.report_uninitialized_variables(tf.global_variables())`. If `None`,
  - the model is not checked for readiness before running local_init_op.
  + `None`. If `None`, the model is not checked for readiness before running
  + local_init_op.
  is_chief: If True, create a chief supervisor in charge of initializing
  and restoring the model. If False, create a supervisor that relies
  on a chief supervisor for inits and restore.
  