Fix 'Update courses' api docs
Fix 'Update courses' api docs

Needed proper indentation. Bulleted lists are rendering
funny but that's a separate issue.

flag=none

test plan:
- See how 'Update a course' docs are all messed up on prod:
  https://canvas.instructure.com/doc/api/courses.html#method.courses.batch_update
- Checkout this code and generate docs: rake doc:api
- View 'Update a course' docs locally
  /doc/api/courses.html#method.courses.batch_update
- Should be fixed (other than wonky lists)

Change-Id: I48e034db9394028c8dcbaa15c9cf607c166f3e2a
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/273676
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Isaac Moore <258108225390078ef47d1319acab49ad7948abf1@instructure.com>
QA-Review: Isaac Moore <258108225390078ef47d1319acab49ad7948abf1@instructure.com>
Product-Review: Nate Armstrong <619b324efbf5f7848de055bdc8bef4c0dd7c8ef5@instructure.com>

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