message: Minor doxygen update
diff: @@ -72,8 +72,8 @@ namespace gko {
  * int main()
  * {
  * auto cpu = create<CpuExecutor>();
  - * auto A = randn_fill<CsrMatrix<float>>(5, 5, 0f, 1f, cpu);
  - * auto x = fill<DenseMatrix<float>>(6, 1, 1f, cpu);
  + * auto A = randn_fill<matrix::Csr<float>>(5, 5, 0f, 1f, cpu);
  + * auto x = fill<matrix::Dense<float>>(6, 1, 1f, cpu);
  * try {
  * auto y = apply(A.get(), x.get());
  * } catch(Error e) {
  