!act,doc #3831 Adding more Java with Lambda documentation and support

* The Java with Lambda support documentation for AbstractActor and AbstractFSM are now on par with Scala
* Many small fixes and additions of missing things
* Added an AbstractActorContext that has convenience functions for getChild and getChildren

akka-docs/rst/scala/code/docs/actor/ActorDocSpec.scala

@@ -82,23 +82,6 @@ class DemoActorWrapper extends Actor {
   def receive = Actor.emptyBehavior
 }
 
-class AnonymousActor extends Actor {
-  //#anonymous-actor
-  def receive = {
-    case m: DoIt =>
-      context.actorOf(Props(new Actor {
-        def receive = {
-          case DoIt(msg) =>
-            val replyMsg = doSomeDangerousWork(msg)
-            sender() ! replyMsg
-            context.stop(self)
-        }
-        def doSomeDangerousWork(msg: ImmutableMessage): String = { "done" }
-      })) forward m
-  }
-  //#anonymous-actor
-}
-
 class Hook extends Actor {
   var child: ActorRef = _
   //#preStart
@@ -283,15 +266,6 @@ class ActorDocSpec extends AkkaSpec(Map("akka.loglevel" -> "INFO")) {
     system.stop(myActor)
   }
 
-  "creating actor with constructor" in {
-    //#creating-constructor
-    // allows passing in arguments to the MyActor constructor
-    val myActor = system.actorOf(Props[MyActor], name = "myactor")
-    //#creating-constructor
-
-    system.stop(myActor)
-  }
-
   "creating a Props config" in {
     //#creating-props
     import akka.actor.Props