typo and removes SDN modules in main-4.16

Author: JoeAldinger

modules/nw-egress-firewall-about.adoc

@@ -40,14 +40,13 @@ An egress firewall has the following limitations:
 +
 The following example illustrates the order of the egress firewall rules necessary to ensure API server access:
 +
-.`EgressFirewall` API server access example
 [source,yaml,subs="attributes+"]
 ----
 apiVersion: k8s.ovn.org/v1
 kind: EgressFirewall
 metadata:
   name: default
-  namespace: <namespace> <1>
+  namespace: <namespace>
 spec:
   egress:
   - to: