message: update comments for ceed backends
diff: @@ -59,11 +59,10 @@ struct Backend
  CEED_CPU = 1 << 10,
  /** @brief [device] CEED CUDA backend working together with the CUDA
  backend. Enabled when MFEM_USE_CEED = YES and MFEM_USE_CUDA = YES.
  - NOTE: The current default libCEED GPU backend is non-deterministic! */
  + NOTE: The current default libCEED CUDA backend is non-deterministic! */
  CEED_CUDA = 1 << 11,
  /** @brief [device] CEED HIP backend working together with the HIP
  - backend. Enabled when MFEM_USE_CEED = YES and MFEM_USE_HIP = YES.
  - NOTE: The current default libCEED HIP backend is non-deterministic! */
  + backend. Enabled when MFEM_USE_CEED = YES and MFEM_USE_HIP = YES. */
  CEED_HIP = 1 << 12,
  /** @brief [device] Debug backend: host memory is READ/WRITE protected
  while a device is in use. It allows to test the "device" code-path
  