doc: link to benchcoin over bitcoinperf

Author: fanquake

doc/benchmarking.md

@@ -74,6 +74,4 @@ specifically aimed at exploring the possible input space.
 Going Further
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-To monitor Bitcoin Core performance more in depth (like reindex or IBD): https://github.com/chaincodelabs/bitcoinperf
-
-To generate Flame Graphs for Bitcoin Core: https://github.com/eklitzke/bitcoin/blob/flamegraphs/doc/flamegraphs.md
+To monitor Bitcoin Core performance more in depth (like reindex or IBD): https://github.com/bitcoin-dev-tools/benchcoin