Add link to profiling recipe from rpc main docs (#45235)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45235
This is so that users know that the profiler works as expected with
RPC and they can learn how to use it to profile RPC-based workloads.
ghstack-source-id: 112773748
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D23777888
fbshipit-source-id: 4805be9b949c8c7929182f291a6524c3c6a725c1
