A bare metal install can use IPv6 for networks

- https://issues.redhat.com/browse/OSDOCS-1640

Author: jboxman

_topic_map.yml

@@ -955,6 +955,8 @@ Topics:
     File: migrate-from-openshift-sdn
   - Name: Rollback to the OpenShift SDN cluster network provider
     File: rollback-to-openshift-sdn
+  - Name: Converting to IPv4/IPv6 dual stack networking
+    File: converting-to-dual-stack
   - Name: IPsec encryption configuration
     File: about-ipsec-ovn
   - Name: Configuring an egress firewall for a project