[docs] Add rosetta instructions to docs

Summary:
Followup from https://linear.app/comm/issue/ENG-4374/problems-with-dev-environment-setup#comment-e374da31
Adding instructions on how to install roesetta for Apple silicon Macs

Test Plan: N/A

Reviewers: jon, ashoat, O6 Docs

Reviewed By: ashoat, O6 Docs

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D8515