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).
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Backport of Core PR12187