message: Use gko namespace prefix consistently
diff: @@ -115,7 +115,7 @@ int main(int argc, char* argv[])
  // the hood call the required smart pointer functions to manage object
  // ownership. The gko::share , gko::give and gko::lend are the functions
  // that you would need to use.
  - auto A = share(gko::read<mtx>(std::ifstream("data/A.mtx"), exec));
  + auto A = gko::share(gko::read<mtx>(std::ifstream("data/A.mtx"), exec));
  auto b = gko::read<vec>(std::ifstream("data/b.mtx"), exec);
  auto x = gko::read<vec>(std::ifstream("data/x0.mtx"), exec);
  