Extend description of Roles
Created by: camerons
Incorporate descriptions of roles and improved processes, as outlined and reviewed in: https://docs.google.com/document/d/1Fu5EWfir8xs9mj9nCa_9l4LItl0wyw75BGhXrKcNJIQ/edit#heading=h.cvrarz76rja3 Addresses: https://github.com/thegooddocsproject/governance/issues/6