message: Update model_to_estimator docstring.
diff: @@ -36,9 +36,13 @@ def model_to_estimator(
  checkpoint_format='saver'):
  """Constructs an `Estimator` instance from given keras model.
  + If you use infrastructure or other tooling that relies on Estimators, you can
  + still build a Keras model and use model_to_estimator to convert the Keras
  + model to an Estimator for use with downstream systems.
  +
  For usage example, please see:
  [Creating estimators from Keras
  - Models](https://tensorflow.org/guide/estimators#model_to_estimator).
  + Models](https://www.tensorflow.org/guide/estimators#creating_estimators_from_keras_models).
  __Sample Weights__
  Estimators returned by `model_to_estimator` are configured to handle sample
  @@ -117,9 +121,13 @@ def model_to_estimator_v2(
  checkpoint_format='checkpoint'):
  """Constructs an `Estimator` instance from given keras model.
  + If you use infrastructure or other tooling that relies on Estimators, you can
  + still build a Keras model and use model_to_estimator to convert the Keras
  + model to an Estimator for use with downstream systems.
  +
  For usage example, please see:
  [Creating estimators from Keras
  - Models](https://tensorflow.org/guide/estimators#model_to_estimator).
  + Models](https://www.tensorflow.org/guide/estimators#creating_estimators_from_keras_models).
  __Sample Weights__
  Estimators returned by `model_to_estimator` are configured to handle sample
  