message: restore docstring of core_layers
diff: @@ -72,8 +72,8 @@ class _MaskedConv(base.Layer):
  linear activation.
  use_bias: Boolean, whether the layer uses a bias.
  kernel_initializer: An initializer for the convolution kernel.
  - bias_initializer: An initializer for the bias vector. If None, the default
  - initializer will be used.
  + bias_initializer: An initializer for the bias vector. If None, no bias will
  + be applied.
  kernel_regularizer: Optional regularizer for the convolution kernel.
  bias_regularizer: Optional regularizer for the bias vector.
  activity_regularizer: Regularizer function for the output.
  @@ -279,8 +279,8 @@ class MaskedConv2D(_MaskedConv):
  linear activation.
  use_bias: Boolean, whether the layer uses a bias.
  kernel_initializer: An initializer for the convolution kernel.
  - bias_initializer: An initializer for the bias vector. If None, the default
  - initializer will be used.
  + bias_initializer: An initializer for the bias vector. If None, no bias will
  + be applied.
  kernel_regularizer: Optional regularizer for the convolution kernel.
  bias_regularizer: Optional regularizer for the bias vector.
  activity_regularizer: Regularizer function for the output.
  