Add documentation about ocaml profiling with perf

Summary: As titled.

Reviewed By: alexkassil

Differential Revision: D69671213

fbshipit-source-id: 5fcb1331bd9351b77abe031f90a039a4c5bb1469

Author: arthaud

documentation/website/sidebars.js

@@ -241,6 +241,7 @@ module.exports = {
           'fb/pysa-tasks-backlog',
           'fb/pysa-quality-analyzer',
           'fb/pysa-sandcastle-internals',
+          'fb/ocaml-profiling',
         ],
       },
     ]),