b21244e0be Updating benchmarkmarking.md with an updated sample output and help options (Jeff Rade)
Pull request description:
This PR is just a documentation update for someone (or myself) that looks into finishing up #7883 in the future.
Looked through #7883 and appears [ryanofsky's PR](https://github.com/bitcoin/bitcoin/pull/8873) setup the benchmarks, but there are `FIXME` comments to pull in data from `test/` to get a larger data set (assuming reason why 7883 is still open).
Tree-SHA512: d758efc659c75f2b3ceb376f5a466c4234354077e4671ac3eb901c082c4e519ce5ff592cea4742711050b4ce56a1b65ef69433dd74e7db3eb11a8567d517d9e2