modify reference to RFC

Author: jmckenna

en/ogc/ogc_api.txt

@@ -78,7 +78,7 @@ aspects of MapServer:
 Links to OGC API-Related Information
 ------------------------------------
 
-- :ref:`rfc134`
+- MapServer's :ref:`RFC 134 <rfc134>`
 - OGC API: Features `specification <https://ogcapi.ogc.org/features/>`__
 - OGC API: Features `workshop module <https://ogcapi-workshop.ogc.org/api-deep-dive/features/>`__
 - pygeoapi OGCAPI demo `landing page <https://demo.pygeoapi.io/master>`__