message: Fix the docstring as it is stale. The initializer has no default in
  EmbeddingColumnLayer.
diff: @@ -1782,9 +1782,7 @@ class _EmbeddingColumnLayer(base.Layer):
  Args:
  embedding_shape: Shape of the embedding variable used for lookup.
  initializer: A variable initializer function to be used in embedding
  - variable initialization. If not specified, defaults to
  - `tf.truncated_normal_initializer` with mean `0.0` and standard deviation
  - `1/sqrt(dimension)`.
  + variable initialization.
  weight_collections: A list of collection names to which the Variable will
  be added. Note that, variables will also be added to collections
  `tf.GraphKeys.GLOBAL_VARIABLES` and `ops.GraphKeys.MODEL_VARIABLES`.
  