#22903 Fix code snippeds

* move scala and java sources out of paradox sources
* replace relative paths with $code$ and $akka$
* fix broken includes

akka-docs/src/main/java/jdocs/camel/OnRouteResponseTestBase.java

@@ -0,0 +1,23 @@
+package jdocs.camel;
+
+import akka.actor.*;
+import akka.testkit.javadsl.TestKit;
+
+public class OnRouteResponseTestBase {
+
+  public void onRouteResponse(){
+    //#RouteResponse
+    ActorSystem system = ActorSystem.create("some-system");
+    Props receiverProps = Props.create(ResponseReceiver.class);
+    final ActorRef receiver = system.actorOf(receiverProps,"responseReceiver");
+    ActorRef forwardResponse = system.actorOf(Props.create(
+        Forwarder.class, "http://localhost:8080/news/akka", receiver));
+    // the Forwarder sends out a request to the web page and forwards the response to
+    // the ResponseReceiver
+    forwardResponse.tell("some request", ActorRef.noSender());
+    //#RouteResponse
+    system.stop(receiver);
+    system.stop(forwardResponse);
+    TestKit.shutdownActorSystem(system);
+  }
+}