message: Fix docstring for DynamicRNNEstimator
  The 'optimizer' argument was referred to as 'optimizer_type'. Also a
  quote sign was forgotten.
diff: @@ -625,14 +625,14 @@ class DynamicRnnEstimator(estimator.Estimator):
  optimizer: The type of optimizer to use. Either a subclass of
  `Optimizer`, an instance of an `Optimizer`, a callback that returns an
  optimizer, or a string. Strings must be one of 'Adagrad', 'Adam',
  - 'Ftrl', 'Momentum', 'RMSProp' or 'SGD. See `layers.optimize_loss` for
  + 'Ftrl', 'Momentum', 'RMSProp' or 'SGD'. See `layers.optimize_loss` for
  more details.
  learning_rate: Learning rate. This argument has no effect if `optimizer`
  is an instance of an `Optimizer`.
  predict_probabilities: A boolean indicating whether to predict
  probabilities for all classes. Used only if `problem_type` is
  `ProblemType.CLASSIFICATION`
  - momentum: Momentum value. Only used if `optimizer_type` is 'Momentum'.
  + momentum: Momentum value. Only used if `optimizer` is 'Momentum'.
  gradient_clipping_norm: Parameter used for gradient clipping. If `None`,
  then no clipping is performed.
  dropout_keep_probabilities: a list of dropout probabilities or `None`.
  