Merge pull request #96050 from openshift-cherrypick-robot/cherry-pick-94491-to-enterprise-4.15

[enterprise-4.15] : Remove erroneous field

Author: jab-rh

modules/nw-operator-cr.adoc

@@ -507,7 +507,6 @@ spec:
   serviceNetwork:
   - 172.30.0.0/16
   networkType: OVNKubernetes
-      clusterNetworkMTU: 8900
 ----
 endif::operator[]