R1:a590e0e753e8

Document even more ways to manage `sshd` ports

Summary: Fixes T11882. Document using `~/.ssh/config` to mitigate the inconvenience of port 2222.

Test Plan: Read document.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11882

Differential Revision: https://secure.phabricator.com/D16894