#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/RequestBodyActor.java

@@ -0,0 +1,20 @@
+package jdocs.camel;
+//#RequestProducerTemplate
+import akka.actor.AbstractActor;
+import akka.camel.Camel;
+import akka.camel.CamelExtension;
+import org.apache.camel.ProducerTemplate;
+
+public class RequestBodyActor extends AbstractActor {
+  @Override
+  public Receive createReceive() {
+    return receiveBuilder()
+      .matchAny(message -> {
+        Camel camel = CamelExtension.get(getContext().getSystem());
+        ProducerTemplate template = camel.template();
+        getSender().tell(template.requestBody("direct:news", message), getSelf());
+      })
+      .build();
+  }
+}
+//#RequestProducerTemplate