Merge pull request #11806 from johnsgp/fix-documentation-of-scheduleOnce

Fix documentation of scheduleOnce

documentation/manual/working/commonGuide/schedule/code/scalaguide/scheduling/CodeBlockTask.scala

@@ -22,7 +22,7 @@ class CodeBlockTask @Inject() (actorSystem: ActorSystem)(implicit executionConte
 
 //#schedule-block-once
 class ScheduleOnceTask @Inject() (actorSystem: ActorSystem)(implicit executionContext: ExecutionContext) {
-  actorSystem.scheduler.scheduleWithFixedDelay(initialDelay = 10.seconds, delay = 10.seconds) { () =>
+  actorSystem.scheduler.scheduleOnce(delay = 10.seconds) { () =>
     // the block of code that will be executed
     actorSystem.log.info("Executing something...")
   }