spec: ensure scopes for pagination are ordered

Change-Id: Ia05f6e813622f1431c542ceb577507de09c678c9
Reviewed-on: https://gerrit.instructure.com/28886
QA-Review: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>