update API doc required params - 9

- Poll choices
- Poll sessions
- Polls
- Quiz extensions
- Quiz question groups

Test plan:
- rake doc:api
- Verify the above doc pages for parameter accuracy

Refs SIS-403

Change-Id: Iefb2933061707390fa3b28428a5183ca214d5d87
Reviewed-on: https://gerrit.instructure.com/39313
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Duane Johnson <duane@instructure.com>
Product-Review: Duane Johnson <duane@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>