message: Fix outside compilation API doc string.
diff: @@ -672,6 +672,9 @@ def outside_compilation(computation, *args, **kwargs):
  ops on CPU's. Below usage of outside compilation will place ops in
  `computation_with_string_ops` on CPU.
  + Example usage:
  +
  + ```python
  def computation_with_string_ops(x):
  # strings types are not supported on TPU's and below ops must
  # run on CPU instead.
  @@ -681,6 +684,7 @@ def outside_compilation(computation, *args, **kwargs):
  def tpu_computation():
  # Expected output is 11.
  output = tf.tpu.outside_compilation(computation_with_string_ops, 1)
  + ```
  Outside compilation should be called inside TPUReplicateContext. That is,
  `tf.tpu.outside_compilation()` should be called inside a function that is
  