Update tutorial-availability-sets.md

Author: cynthn

articles/virtual-machines/linux/tutorial-availability-sets.md

@@ -14,7 +14,7 @@ ms.workload: infrastructure-services
 ms.tgt_pltfrm: vm-linux
 ms.devlang: na
 ms.topic: tutorial
-ms.date: 10/05/2017
+ms.date: 08/24/2018
 ms.author: cynthn
 ms.custom: mvc
 
@@ -81,8 +81,7 @@ for i in `seq 1 2`; do
      --subnet mySubnet \
      --image UbuntuLTS \
      --admin-username azureuser \
-     --generate-ssh-keys \
-	 --no-wait
+     --generate-ssh-keys
 done
 ```