add api-ref for dbss

otc_metadata/data/documents/dbss-api-ref.yaml

@@ -0,0 +1,9 @@
+---
+hc_location: api/dbss
+html_location: docs/dbss/api-ref
+link: /database-security-service/api-ref/
+pdf_name: dbss-api-ref
+rst_location: api-ref/source
+service_type: dbss
+title: API Reference
+type: api-ref