message: add back-ticks for formatting
  add back-ticks for formatting
diff: @@ -1422,7 +1422,7 @@ def sparse_tensor_to_dense(sp_input,
  [c x x x x]]
  Indices must be without repeats. This is only
  - tested if validate_indices is True.
  + tested if `validate_indices` is `True`.
  Args:
  sp_input: The input `SparseTensor`.
  