topic map name change

Author: skopacz1

_topic_maps/_topic_map.yml

@@ -409,7 +409,7 @@ Topics:
     File: installing-with-agent-basic
   - Name: Installing a cluster with customizations
     File: installing-with-agent-based-installer
-  - Name: Installing an OpenShift Virtualization Engine cluster in a disconnected environment
+  - Name: Installing a cluster without an external registry
     File: installing-ove
   - Name: Preparing PXE assets for OCP
     File: prepare-pxe-assets-agent