#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/actor/MyActor.java

@@ -0,0 +1,33 @@
+/**
+ * Copyright (C) 2009-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package jdocs.actor;
+
+//#imports
+import akka.actor.AbstractActor;
+import akka.event.Logging;
+import akka.event.LoggingAdapter;
+
+//#imports
+
+//#my-actor
+public class MyActor extends AbstractActor {
+  private final LoggingAdapter log = Logging.getLogger(getContext().getSystem(), this);
+
+  @Override
+  public Receive createReceive() {
+    return receiveBuilder()
+      .match(String.class, s -> {
+        log.info("Received String message: {}", s);
+        //#my-actor
+        //#reply
+        getSender().tell(s, getSelf());
+        //#reply
+        //#my-actor
+      })
+      .matchAny(o -> log.info("received unknown message"))
+      .build();
+  }
+}
+//#my-actor