message: Minor format improvement.
diff: @@ -123,7 +123,7 @@ int main(int argc, char *argv[])
  // Get the data from `returnobject_logger` and print an element
  auto loggeddata = returnobject_logger->get_return_object();
  - std::cout << loggeddata->residual->at(1, 1) << std::endl;
  + std::cout << "Residual(1) : " << loggeddata->residual->at(1) << std::endl;
  // Print result
  auto h_x = gko::clone(exec->get_master(), x);
  