#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/stream/javadsl/cookbook/RecipeTest.java

@@ -0,0 +1,42 @@
+package jdocs.stream.javadsl.cookbook;
+
+import jdocs.AbstractJavaTest;
+
+public abstract class RecipeTest extends AbstractJavaTest {
+  final class Message {
+    public final String msg;
+
+    public Message(String msg) {
+      this.msg = msg;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+      if (this == o) {
+        return true;
+      }
+      if (o == null || getClass() != o.getClass()) {
+        return false;
+      }
+
+      Message message = (Message) o;
+
+      if (msg != null ? !msg.equals(message.msg) : message.msg != null) {
+        return false;
+      }
+
+      return true;
+    }
+
+    @Override
+    public int hashCode() {
+      return msg != null ? msg.hashCode() : 0;
+    }
+  }
+
+  final class Trigger {
+  }
+
+  final class Job {
+  }
+}