message: Make tf.size() docstring example testable.
diff: @@ -645,10 +645,9 @@ def size_v2(input, out_type=dtypes.int32, name=None):
  For example:
  - ```python
  - t = tf.constant([[[1, 1, 1], [2, 2, 2]], [[3, 3, 3], [4, 4, 4]]])
  - tf.size(t) # 12
  - ```
  + >>> t = tf.constant([[[1, 1, 1], [2, 2, 2]], [[3, 3, 3], [4, 4, 4]]])
  + >>> tf.size(t)
  + <tf.Tensor: shape=(), dtype=int32, numpy=12>
  Args:
  input: A `Tensor` or `SparseTensor`.
  