OCPBUGS-43623:clarifies wording for CIDR ranges to avoid in OVN-K

Author: JoeAldinger

modules/nw-ovn-kubernetes-migration-about.adoc

@@ -47,7 +47,7 @@ While the OVN-Kubernetes network plugin implements many of the capabilities pres
 * Egress router pods
 --
 
-* OVN-Kubernetes, the default network provider in {product-title} 4.14 and later versions, uses the following IP address ranges internally: `100.64.0.0/16`, `169.254.169.0/29`, `100.88.0.0/16`, `fd98::/64`, `fd69::/125`, and `fd97::/64`. If your cluster uses OVN-Kubernetes, do not include any of these IP address ranges in any other CIDR definitions in your cluster or infrastructure.
+* Before migrating to OVN-Kubernetes, ensure that the following IP address ranges are not in use: `100.64.0.0/16`, `169.254.169.0/29`, `100.88.0.0/16`, `fd98::/64`, `fd69::/125`, and `fd97::/64`. OVN-Kubernetes uses these ranges internally. Do not include any of these ranges in any other CIDR definitions in your cluster or infrastructure.
 
 The following sections highlight the differences in configuration between the aforementioned capabilities in OVN-Kubernetes and OpenShift SDN network plugins.