Adding documentation to provide an example Spring AMPQ RabbitMQ Stream plugin support to set the Super Stream Routing

Signed-off-by: Gregory Green <ggreen@cloudnativedata.io>

Author: cloudnativedata

src/reference/antora/modules/ROOT/pages/stream.adoc

@@ -262,12 +262,24 @@ You must add a `superStreamRoutingFunction` to the `RabbitStreamTemplate`:
 RabbitStreamTemplate streamTemplate(Environment env) {
     RabbitStreamTemplate template = new RabbitStreamTemplate(env, "stream.queue1");
     template.setSuperStreamRouting(message -> {
-        // some logic to return a String for the client's hashing algorithm
+        // some logic to return a String for the client's routing hashing algorithm
+        return message.getApplicationProperties().get("ROUTING_KEY").toString();
     });
     return template;
 }
 ----
 
+The following is an example of sending a message using a RabbitStreamTemplate
+
+[source, java]
+----
+    //Send a message with the routing property for the hashing algorithm
+    rabbitStreamTemplate.send(rabbitStreamTemplate
+            .messageBuilder().addData(converter.convert(domainObject))
+            .applicationProperties().entry("ROUTING_KEY",domainObject.getId())
+            .messageBuilder().build());
+----
+
 You can also publish over AMQP, using the `RabbitTemplate`.
 
 [[super-stream-consumer]]