[STREAMING][DOCS][EXAMPLES] Minor fixes

Author: Jacek Laskowski <jacek@japila.pl>

Closes #10603 from jaceklaskowski/streaming-actor-custom-receiver.

docs/streaming-custom-receivers.md

@@ -257,9 +257,9 @@ The following table summarizes the characteristics of both types of receivers
 
 ## Implementing and Using a Custom Actor-based Receiver
 
-Custom [Akka Actors](http://doc.akka.io/docs/akka/2.2.4/scala/actors.html) can also be used to
+Custom [Akka Actors](http://doc.akka.io/docs/akka/2.3.11/scala/actors.html) can also be used to
 receive data. The [`ActorHelper`](api/scala/index.html#org.apache.spark.streaming.receiver.ActorHelper)
-trait can be applied on any Akka actor, which allows received data to be stored in Spark using
+trait can be mixed in to any Akka actor, which allows received data to be stored in Spark using
  `store(...)` methods. The supervisor strategy of this actor can be configured to handle failures, etc.
 
 {% highlight scala %}
@@ -273,8 +273,8 @@ class CustomActor extends Actor with ActorHelper {
 And a new input stream can be created with this custom actor as
 
 {% highlight scala %}
-// Assuming ssc is the StreamingContext
-val lines = ssc.actorStream[String](Props(new CustomActor()), "CustomReceiver")
+val ssc: StreamingContext = ...
+val lines = ssc.actorStream[String](Props[CustomActor], "CustomReceiver")
 {% endhighlight %}
 
 See [ActorWordCount.scala](https://github.com/apache/spark/blob/master/examples/src/main/scala/org/apache/spark/examples/streaming/ActorWordCount.scala)

examples/src/main/scala/org/apache/spark/examples/streaming/ActorWordCount.scala

@@ -62,15 +62,13 @@ class FeederActor extends Actor {
   }.start()
 
   def receive: Receive = {
-
     case SubscribeReceiver(receiverActor: ActorRef) =>
       println("received subscribe from %s".format(receiverActor.toString))
-    receivers = LinkedList(receiverActor) ++ receivers
+      receivers = LinkedList(receiverActor) ++ receivers
 
     case UnsubscribeReceiver(receiverActor: ActorRef) =>
       println("received unsubscribe from %s".format(receiverActor.toString))
-    receivers = receivers.dropWhile(x => x eq receiverActor)
-
+      receivers = receivers.dropWhile(x => x eq receiverActor)
   }
 }
 
@@ -129,9 +127,9 @@ object FeederActor {
  *   <hostname> and <port> describe the AkkaSystem that Spark Sample feeder is running on.
  *
  * To run this example locally, you may run Feeder Actor as
- *    `$ bin/run-example org.apache.spark.examples.streaming.FeederActor 127.0.1.1 9999`
+ *    `$ bin/run-example org.apache.spark.examples.streaming.FeederActor 127.0.0.1 9999`
  * and then run the example
- *    `$ bin/run-example org.apache.spark.examples.streaming.ActorWordCount 127.0.1.1 9999`
+ *    `$ bin/run-example org.apache.spark.examples.streaming.ActorWordCount 127.0.0.1 9999`
  */
 object ActorWordCount {
   def main(args: Array[String]) {