message: Minor updates on the comments
diff: @@ -154,7 +154,7 @@ class GraphDefBuilderWrapper {
  }
  // Adds a node corresponding to the `DatasetType` to the Graph.
  - // Return value of `DatasetType::op_name()` is used as the op type for the
  + // Return value of `DatasetType::type_string()` is used as the op type for the
  // node.
  // Values for the output_types and output_shapes node attributes are also
  // written if those attributes are defined in the OpDef.
  