Add email/sms route docs and section on template format
Add email/sms route docs and section on template format

Summary: We will need to update the fragment links to the routing rules in the dashboard

Test Plan: Read it

Reviewers: phogan

Reviewed By: phogan

Maniphest Tasks: T2735

Differential Revision: https://phabricator.knkdt.com/D1484

hologram-io/docs,hologram-io/docs