message: Fixing small typo
diff: @@ -29,7 +29,7 @@ namespace mfem
  LinearForm and BilinearForm objects. The DofTransformation class is
  designed to apply the action of both of these types of DoF transformations.
  - Let the "primal transformation" by given by the operator T. This means that
  + Let the "primal transformation" be given by the operator T. This means that
  given a local element vector v the data that must be placed into a
  GridFunction object is v_t = T * v.
  