update API doc required params - 2

- Appointment groups
- Assignment groups
- Assignments
- Authentications log
- Calendar events

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

Refs SIS-403

Change-Id: If4b6d194f1f262118700dbdb4b09c55b1b9e3f19
Reviewed-on: https://gerrit.instructure.com/38664
Reviewed-by: Duane Johnson <duane@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Tyler Pickett <tpickett+gerrit@instructure.com>
Product-Review: Duane Johnson <duane@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>