fix formatting of special ids in api docs

Change-Id: I49499d4dadde3d83ed7b545317723ebad1eae6fd
Reviewed-on: https://gerrit.instructure.com/30101
Reviewed-by: Rob Orton <rob@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>