message: Remove docs from `tf.distribute.Strategy` from methods that we plan to
  move from that class.
diff: @@ -546,6 +546,7 @@ class DistributionStrategy(object):
  return self._extended.update_non_slot(
  colocate_with, fn, args, kwargs, group)
  + @doc_controls.do_not_generate_docs # DEPRECATED, -> `DistributedValues`
  def unwrap(self, value):
  """Returns the list of all per-replica values contained in `value`.
  @@ -564,6 +565,7 @@ class DistributionStrategy(object):
  """DEPRECATED: use extended.value_container() instead."""
  return self._extended.value_container(value)
  + @doc_controls.do_not_generate_docs # DEPRECATED, -> `DistributedValues`
  def group(self, value, name=None):
  """Shortcut for `tf.group(self.unwrap(value))`."""
  return self._extended._group(value, name) # pylint: disable=protected-access
  @@ -580,6 +582,7 @@ class DistributionStrategy(object):
  return self._extended._num_replicas_in_sync # pylint: disable=protected-access
  @property
  + @doc_controls.do_not_generate_docs # DEPRECATED, moving to `extended`
  def worker_devices(self):
  """DEPRECATED: use extended.worker_devices instead."""
  return self._extended.worker_devices
  