message: FIx CudnnCompatibleLSTM document error
  Fix the CudnnCompatibleLSTM document error, it should be tf.contrib.cudnn_rnn.CudnnCompatibleLSTMCell instead of tf.contrib.cudnn_rnn.CudnnCompatibleLSTM.
diff: @@ -104,7 +104,7 @@ class _CudnnRNN(base_layer.Layer):
  # Inference subgraph for unidirectional RNN on, e.g., CPU or mobile.
  with tf.Graph().as_default():
  - single_cell = lambda: tf.contrib.cudnn_rnn.CudnnCompatibleLSTM(num_units)
  + single_cell = lambda: tf.contrib.cudnn_rnn.CudnnCompatibleLSTMCell(num_units)
  # NOTE: Even if there's only one layer, the cell needs to be wrapped in
  # MultiRNNCell.
  @@ -124,7 +124,7 @@ class _CudnnRNN(base_layer.Layer):
  # Inference subgraph for bidirectional RNN
  with tf.Graph().as_default():
  - single_cell = lambda: tf.contrib.cudnn_rnn.CudnnCompatibleLSTM(num_units)
  + single_cell = lambda: tf.contrib.cudnn_rnn.CudnnCompatibleLSTMCell(num_units)
  cells_fw = [single_cell() for _ in range(num_layers)]
  cells_bw = [single_cell() for _ in range(num_layers)]
  