Fix Quiz Questions API doc data type
Fix Quiz Questions API doc data type

"answers" array must have a type. Should probably be "string".

Test Plan:
- QuizQuestion model in API docs should have an "answers" array of
  type "string".

Change-Id: I431bcb54c1344acac259495658fe0a564d0bfac7
Reviewed-on: https://gerrit.instructure.com/27213
Reviewed-by: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Josh Simpson <bfb4987b134a00f73d881fff5113b1d5fa1876bc@instructure.com>
Product-Review: Duane Johnson <0a02221ea64f4c9685145b5f44cf84715b4a8bb5@instructure.com>

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