Remove maximum rules limit for EgressNetworkPolicy

- https://bugzilla.redhat.com/show_bug.cgi?id=1879910

Author: jboxman

modules/nw-egressnetworkpolicy-about.adoc

@@ -60,7 +60,9 @@ An egress firewall has the following limitations:
 
 * No project can have more than one {kind} object.
 
-* A maximum of one {Kind} object with a maximum of 50 rules can be defined per project.
+ifdef::ovn[]
+* A maximum of one {kind} object with a maximum of 50 rules can be defined per project.
+endif::ovn[]
 
 ifdef::openshift-sdn[]
 * The `default` project cannot use an egress firewall.