Added note about how to support a whitelist for multiple IPs or subnets.

Author: jonquilwilliams

modules/nw-route-specific-annotations.adoc

@@ -7,6 +7,10 @@
 
 The Ingress Controller can set the default options for all the routes it exposes. An individual route can override some of these defaults by providing specific configurations in its annotations.
 
+[IMPORTANT]
+====
+To create a whitelist with multiple source IPs or subnets, use a space-delimited list. Any other delimiter type causes the list to be ignored without a warning or error message.
+====
 
 //For all the variables outlined in this section, you can set annotations on the
 //*route definition* for the route to alter its configuration.