message: Remove innaccurate documentation (I think).
diff: @@ -416,9 +416,7 @@ public:
  returned in the variable @a A, of type OpType, holding a *reference* to
  the system matrix (created with the method OpType::MakeRef()). The
  reference will be invalidated when SetOperatorType(), Update(), or the
  - destructor is called.
  -
  - Currently, this method can be used only with AssemblyLevel::LEGACYFULL. */
  + destructor is called. */
  template <typename OpType>
  void FormLinearSystem(const Array<int> &ess_tdof_list, Vector &x, Vector &b,
  OpType &A, Vector &X, Vector &B,
  @@ -440,9 +438,7 @@ public:
  returned in the variable @a A, of type OpType, holding a *reference* to
  the system matrix (created with the method OpType::MakeRef()). The
  reference will be invalidated when SetOperatorType(), Update(), or the
  - destructor is called.
  -
  - Currently, this method can be used only with AssemblyLevel::LEGACYFULL. */
  + destructor is called. */
  template <typename OpType>
  void FormSystemMatrix(const Array<int> &ess_tdof_list, OpType &A)
  {
  @@ -862,9 +858,7 @@ public:
  returned in the variable @a A, of type OpType, holding a *reference* to
  the system matrix (created with the method OpType::MakeRef()). The
  reference will be invalidated when SetOperatorType(), Update(), or the
  - destructor is called.
  -
  - Currently, this method can be used only with AssemblyLevel::LEGACYFULL. */
  + destructor is called. */
  template <typename OpType>
  void FormRectangularSystemMatrix(const Array<int> &trial_tdof_list,
  const Array<int> &test_tdof_list, OpType &A)
  @@ -894,9 +888,7 @@ public:
  returned in the variable @a A, of type OpType, holding a *reference* to
  the system matrix (created with the method OpType::MakeRef()). The
  reference will be invalidated when SetOperatorType(), Update(), or the
  - destructor is called.
  -
  - Currently, this method can be used only with AssemblyLevel::LEGACYFULL. */
  + destructor is called. */
  template <typename OpType>
  void FormRectangularLinearSystem(const Array<int> &trial_tdof_list,
  const Array<int> &test_tdof_list,
  