Merge #17081: doc: fix Makefile target in benchmarking.md

a54ab21 [doc] fix Makefile target in benchmarking.md (Sebastian Falbesoner)

Pull request description:

  While the resulting binary is called `bench_bitcoin`, the Makefile target is
  named `bitcoin_bench` (see `src/Makefile.bench.include`)

ACKs for top commit:
  fanquake:
    ACK a54ab21 - Tested on macOS and Debian 9.9, as this only [seemed to work there](bitcoin/bitcoin#16536 (comment)) when these docs were added.

Tree-SHA512: bcf8d48ccba488f0533111a3be57ddc6c948b3a38beed129635e1c7e0b4608bc9ddf625e8469606bb31d4cedf3341c443564a197d6b1ab5268a9ed44ed5018a3

Author: fanquake

doc/benchmarking.md

@@ -11,7 +11,7 @@ Running
 For benchmarks purposes you only need to compile `bitcoin_bench`. Beware of configuring without `--enable-debug` as this would impact
 benchmarking by unlatching log printers and lock analysis.
 
-    make -C src bench_bitcoin
+    make -C src bitcoin_bench
 
 After compiling bitcoin-core, the benchmarks can be run with: