fix warnings in contrib, docs, osgi, persistence and slf4j

akka-docs/rst/scala/code/docs/io/EchoServer.scala

@@ -70,18 +70,19 @@ class EchoManager(handlerClass: Class[_]) extends Actor with ActorLogging {
 
 }
 
+//#echo-handler
 object EchoHandler {
+  final case class Ack(offset: Int) extends Tcp.Event
+
   def props(connection: ActorRef, remote: InetSocketAddress): Props =
     Props(classOf[EchoHandler], connection, remote)
 }
 
-//#echo-handler
 class EchoHandler(connection: ActorRef, remote: InetSocketAddress)
   extends Actor with ActorLogging {
 
   import Tcp._
-
-  final case class Ack(offset: Int) extends Event
+  import EchoHandler._
 
   // sign death pact: this actor terminates when connection breaks
   context watch connection

akka-docs/rst/scala/code/docs/io/UdpDocSpec.scala

@@ -87,8 +87,9 @@ object ScalaUdpDocSpec {
       //#connected
       case msg: String =>
         connection ! UdpConnected.Send(ByteString(msg))
-      case d @ UdpConnected.Disconnect => connection ! d
-      case UdpConnected.Disconnected   => context.stop(self)
+      case UdpConnected.Disconnect =>
+        connection ! UdpConnected.Disconnect
+      case UdpConnected.Disconnected => context.stop(self)
     }
   }
   //#connected