topic_map: Remove FCOS acronym

Unify with other mentions of Fedora CoreOS

Author: travier

_topic_maps/_topic_map.yml

@@ -612,7 +612,7 @@ Topics:
 - Name: Red Hat Enterprise Linux CoreOS image layering
   File: coreos-layering
   Distros: openshift-enterprise
-- Name: Fedora CoreOS (FCOS) image layering
+- Name: Fedora CoreOS image layering
   File: coreos-layering
   Distros: openshift-origin
 - Name: AWS Local Zone tasks