Additional examples of config when running as service

## What is your suggestion?
Include additional config examples of the yaml when running as a service

## How will this improve the docs?
Makes it easier to run the coder server as a service without relying on a terminal

## Are you interested in submitting a PR for this?
I wish I knew enough to be able to do so.

## What am I struggling with?
With the existing config.yaml as a service, I am unable to remove the password based auth so my ODIC can take over as primary auth , instead navigating to the IP:port brings up a password prompt that can not be removed or modified.