Fix documentation to require "sudo" for bin/aphlict

Summary: This script must run as root because it requires a privileged port to enable the flash cross-domain stuff. We give you a useful error message if you don't run it as root, but can be more clear in the documentation.

Test Plan: Read file

Reviewers: Afaque_Hussain, btrahan

Reviewed By: Afaque_Hussain

CC: aran

Differential Revision: https://secure.phabricator.com/D4867