message: Update docs for return values as well
diff: @@ -770,7 +770,8 @@ def cast(x, dtype, name=None):
  name: A name for the operation (optional).
  Returns:
  - A `Tensor` or `SparseTensor` with same shape as `x`.
  + A `Tensor` or `SparseTensor` with same shape as `x` and
  + same type as `dtype`.
  Raises:
  TypeError: If `x` cannot be cast to the `dtype`.
  