#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/cluster/StatsWorker.java

@@ -0,0 +1,27 @@
+package jdocs.cluster;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import akka.actor.AbstractActor;
+
+//#worker
+public class StatsWorker extends AbstractActor {
+
+  Map<String, Integer> cache = new HashMap<String, Integer>();
+
+  @Override
+  public Receive createReceive() {
+    return receiveBuilder()
+      .match(String.class, word -> {
+        Integer length = cache.get(word);
+        if (length == null) {
+          length = word.length();
+          cache.put(word, length);
+        }
+        getSender().tell(length, getSelf());
+      })
+      .build();
+  }
+}
+//#worker