fixed invalid EgressIPconfig sample config

A valid Network configuration can be found here:
https://docs.openshift.com/container-platform/4.12/networking/cluster-network-operator.html#nw-operator-example-cr_cluster-network-operator

Author: paumr

modules/nw-egress-ips-config-object.adoc

@@ -12,10 +12,11 @@ The following YAML describes changing the `reachabilityTotalTimeoutSeconds` from
 
 [source,yaml]
 ----
-apiVersion: k8s.ovn.org/v1
-kind: EgressIP
-  name: networks.operator.openshift.io
-  spec:
+apiVersion: operator.openshift.io/v1
+kind: Network
+metadata:
+  name: cluster
+spec:
   clusterNetwork:
   - cidr: 10.128.0.0/14
     hostPrefix: 23