Fix wrong path in benchmarks instructions

Author: strager

website/public/benchmarks/README.md

@@ -6,4 +6,4 @@ This directory contains benchmark results for display on the website.
 
     $ # Run the benchmarks:
     $ cd benchmark/benchmark-lsp/
-    $ stack run -- -m glob "*/open-wait-close/express-router.js" --json ../../website/benchmarks/open-wait-close-express-router-js.json --time-limit 20
+    $ stack run -- -m glob "*/open-wait-close/express-router.js" --json ../../website/public/benchmarks/open-wait-close-express-router-js.json --time-limit 20