Serveral typos to trigger Jenkins

Author: WangTaoTheTonic

core/src/main/scala/org/apache/spark/network/nio/Connection.scala

@@ -460,7 +460,7 @@ private[spark] class ReceivingConnection(
     if (currId != null) currId else super.getRemoteConnectionManagerId()
   }
 
-  // The reciever's remote address is the local socket on remote side : which is NOT
+  // The receiver's remote address is the local socket on remote side : which is NOT
   // the connection manager id of the receiver.
   // We infer that from the messages we receive on the receiver socket.
   private def processConnectionManagerId(header: MessageChunkHeader) {

core/src/main/scala/org/apache/spark/network/nio/ConnectionManager.scala

@@ -501,7 +501,7 @@ private[nio] class ConnectionManager(
 
   def changeConnectionKeyInterest(connection: Connection, ops: Int) {
     keyInterestChangeRequests += ((connection.key, ops))
-    // so that registerations happen !
+    // so that registrations happen !
     wakeupSelector()
   }
 
@@ -832,7 +832,7 @@ private[nio] class ConnectionManager(
   }
 
   /**
-   * Send a message and block until an acknowldgment is received or an error occurs.
+   * Send a message and block until an acknowledgment is received or an error occurs.
    * @param connectionManagerId the message's destination
    * @param message the message being sent
    * @return a Future that either returns the acknowledgment message or captures an exception.