message: clarify what UseMFEMLinearSolver and UseSundialsLinearSolver attach
diff: @@ -148,10 +148,13 @@ public:
  */
  virtual void Step(Vector &x, double &t, double &dt);
  - /// Attach an MFEM linear solver to CVODE.
  + /** @brief Attach the linear system setup and solve methods from the
  + TimeDependentOperator i.e., SUNImplicitSetup() and SUNImplicitSolve() to
  + CVODE.
  + */
  void UseMFEMLinearSolver();
  - /// Attach SUNDIALS linear solver to CVODE.
  + /// Attach SUNDIALS GMRES linear solver to CVODE.
  void UseSundialsLinearSolver();
  /// Select the CVODE step mode: CV_NORMAL (default) or CV_ONE_STEP.
  @@ -279,10 +282,13 @@ public:
  */
  virtual void Step(Vector &x, double &t, double &dt);
  - /// Attach an MFEM linear solver solver to ARKode.
  + /** @brief Attach the linear system setup and solve methods from the
  + TimeDependentOperator i.e., SUNImplicitSetup() and SUNImplicitSolve() to
  + ARKode.
  + */
  void UseMFEMLinearSolver();
  - /// Attach a SUNDIALS linear solver to ARKode.
  + /// Attach a SUNDIALS GMRES linear solver to ARKode.
  void UseSundialsLinearSolver();
  /// Attach an MFEM mass matrix linear solver to ARKode.
  