Dashify benchmarking.md binary name

Author: codablock

doc/benchmarking.md

@@ -5,7 +5,7 @@ Dash Core has an internal benchmarking framework, with benchmarks
 for cryptographic algorithms such as SHA1, SHA256, SHA512 and RIPEMD160. As well as the rolling bloom filter.
 
 After compiling dash-core, the benchmarks can be run with:
-`src/bench/bench_bitcoin`
+`src/bench/bench_dash`
 
 The output will look similar to:
 ```