message: Update documentation for export_savedmodel().
diff: @@ -1902,11 +1902,6 @@ class TPUEstimator(estimator_lib.Estimator):
  ...
  ```
  - Current limitations:
  - --------------------
  -
  - 1. Outside compilation does not work yet (b/79991729).
  -
  """
  def __init__(self,
  