message: Adjusting comment on new const member functions
diff: @@ -76,7 +76,7 @@ public:
  //! Return a reference to block i,j
  Operator & GetBlock(int i, int j)
  { MFEM_VERIFY(op(i,j), ""); return *op(i,j); }
  - //! Read only access to the reference to block i,j
  + //! Return a reference to block i,j (const version)
  const Operator & GetBlock(int i, int j) const
  { MFEM_VERIFY(op(i,j), ""); return *op(i,j); }
  //! Return the coefficient for block i,j
  @@ -160,7 +160,7 @@ public:
  Operator & GetDiagonalBlock(int iblock)
  { MFEM_VERIFY(op[iblock], ""); return *op[iblock]; }
  - //! Read only access to the reference to block i,i.
  + //! Return a reference to block i,i (const version).
  const Operator & GetDiagonalBlock(int iblock) const
  { MFEM_VERIFY(op[iblock], ""); return *op[iblock]; }
  