Update docs to reflect current tutorial code

Update tutorial docs to be current

/cc @zendesk/zendesk-radar

### Steps to merge
 - [ ] :+1: of the team

### References
 - https://zendesk.atlassian.net/browse/RADAR-422 (mainly this)
 - https://zendesk.atlassian.net/browse/RADAR-419

### Risks
 - Low: documentation is still incorrect, and misleads users