message: Updates to addn
diff: op {
  graph_op_name: "AddN"
  - in_arg {
  - name: "inputs"
  - description: <<END
  -Must all be the same size and shape.
  -END
  - }
  summary: "Add all input tensors element wise."
  + description: <<END
  + Inputs must be of same size and shape.
  ```python
  x = [9, 7, 10]
  