message: Update tf.assert_shapes
diff: @@ -1647,10 +1647,10 @@ def assert_shapes(shapes, data=None, summarize=None, message=None, name=None):
  ```python
  tf.assert_shapes({
  - (x, ('N', 'Q')),
  - (y, ('N', 'D')),
  - (param, ('Q',)),
  - (scalar, ())
  + x, ('N', 'Q'),
  + y, ('N', 'D'),
  + param, ('Q',),
  + scalar, (),
  })
  ```
  