Fixed filename on next steps document
Also fixed the person_type bug for motion tester
close #554
### In this PR, I have:
* [x] Manually tested to ensure my PR is working
* [x] Ensured issues that this PR closes will be [automatically closed](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
* [x] Requested review from Mia or Quinten
* [ ] Ensured automated tests are passing
* [ ] Updated automated tests so they are now passing
* [ ] There were no automated tests on this repo so I filled out [this interview](https://apps-dev.suffolklitlab.org/run/test-setup/) and there is now an "it runs" test