message: Small doc improvment.
diff: of high-order codes.
  See: ceed.exascaleproject.org/bps and github.com/CEED/benchmarks
  +
  + * --benchmark_filter=[SetupBP/BP/BK][1-6][PARTIAL/ELEMENT/FULL]/[1-max_order]
  + * --benchmark_context=device=[cpu/cuda/hip]
  */
  // The maximum polynomial order used for benchmarking
  