Add api docs for internal api
Add api docs for internal api

ministryofjustice/defence-request-service-auth,ministryofjustice/ds-auth,ministryofjustice/defence-request-service-auth,ministryofjustice/ds-auth,ministryofjustice/defence-request-service-auth,ministryofjustice/ds-auth,ministryofjustice/ds-auth,ministryofjustice/defence-request-service-auth