benchmark: fix URL in _http-benchmarkers.js

PR-URL: https://github.com/nodejs/node/pull/12455
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/_http-benchmarkers.js

@@ -5,7 +5,7 @@ const path = require('path');
 const fs = require('fs');
 
 const requirementsURL =
-  'https://github.com/nodejs/node/blob/master/doc/guides/writing-and-running-benchmarks.md##http-benchmark-requirements';
+  'https://github.com/nodejs/node/blob/master/doc/guides/writing-and-running-benchmarks.md#http-benchmark-requirements';
 
 // The port used by servers and wrk
 exports.PORT = process.env.PORT || 12346;