message: Enhance doc: column oriented -> column-oriented
diff: @@ -31,7 +31,7 @@ class DenseFeatures(fc._BaseFeaturesLayer): # pylint: disable=protected-access
  """A layer that produces a dense `Tensor` based on given `feature_columns`.
  Generally a single example in training data is described with FeatureColumns.
  - At the first layer of the model, this column oriented data should be converted
  + At the first layer of the model, this column-oriented data should be converted
  to a single `Tensor`.
  This layer can be called multiple times with different features.
  