Add note about making bot a server admin

docs/configuring-playbook-bot-mjolnir.md

@@ -21,6 +21,8 @@ You can use the playbook to [register a new user](registering-users.md):
 ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=bot.mjolnir password=PASSWORD_FOR_THE_BOT admin=no' --tags=register-user
 ```
 
+If you would like Mjolnir to be able to deactivate users, move aliases, shutdown rooms, etc then it must be a server admin so you need to change `admin=no` to `admin=yes` in the  command above.
+
 
 ## 2. Get an access token