message: Minor doc clarification for reduce_sum return type
diff: @@ -1402,10 +1402,11 @@ def reduce_sum(input_tensor,
  keep_dims: Deprecated alias for `keepdims`.
  Returns:
  - The reduced tensor.
  + The reduced tensor, of the same dtype as the input_tensor.
  @compatibility(numpy)
  - Equivalent to np.sum
  + Equivalent to np.sum appart the fact that numpy upcast uint8 and int32 to
  + int64 while tensorflow returns the same dtype as the input.
  @end_compatibility
  """
  keepdims = deprecation.deprecated_argument_lookup("keepdims", keepdims,
  