Use plugin instead of plug-in for networking TOC entry

Author: jab-rh

_topic_maps/_topic_map.yml

@@ -1235,7 +1235,7 @@ Topics:
     File: ovn-kubernetes-troubleshooting-sources
   - Name: OVN-Kubernetes traffic tracing
     File: ovn-kubernetes-tracing-using-ovntrace
-  - Name: Migrating from the OpenShift SDN network plug-in
+  - Name: Migrating from the OpenShift SDN network plugin
     File: migrate-from-openshift-sdn
   - Name: Rolling back to the OpenShift SDN network plugin
     File: rollback-to-openshift-sdn