OSDOCS-6344: updates MTU parameter for InFw operator for 4.14

Author: JoeAldinger

modules/nw-infw-operator-cr.adoc

@@ -14,7 +14,7 @@ You configure `rules` of the `IngressNodeFirewall` CR and apply them to clusters
 ====
 The Ingress Node Firewall Operator supports only stateless firewall rules.
 
-The maximum transmission units (MTU) parameter is 4Kb (kilobytes) in {product-title} {product-version}.
-
 Network interface controllers (NICs) that do not support native XDP drivers will run at a lower performance.
+
+For {product-title} 4.14, you must run Ingress Node Firewall Operator on {op-system-base} 9.0 or later.
 ====