message: Fix comment in lor-transfer miniapp
diff: // low-order refined (LOR) finite element space, typically defined by 0th or 1st
  // order functions on a low-order refinement of the HO mesh.
  //
  -// Two main operators are illustrated:
  +// The grid transfer operators are represented using either
  +// InterpolationGridTransfer or L2ProjectionGridTransfer (depending on the
  +// options requested by the user). The two transfer operators are then:
  //
  -// 1. R: HO -> LOR, defined by FiniteElementSpace::GetTransferOperator
  -// 2. P: LOR -> HO, defined by FiniteElementSpace::GetReverseTransferOperator
  +// 1. R: HO -> LOR, defined by GridTransfer::ForwardOperator
  +// 2. P: LOR -> HO, defined by GridTransfer::BackwardOperator
  //
  // While defined generally, these operators have some nice properties for
  // particular finite element spaces. For example they satisfy PR=I, plus mass
  