[backport#12187] [Docs] Updating benchmarkmarking.md with an updated sample output
Summary:
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).
Backport of Core PR12187
Test Plan: read it
Reviewers: #bitcoin_abc, PiRK
Reviewed By: PiRK
Differential Revision: https://reviews.bitcoinabc.org/D8205