Update tutorial-availability-sets.md

Author: cynthn

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

@@ -77,6 +77,8 @@ for i in `seq 1 2`; do
      --name myVM$i \
      --availability-set myAvailabilitySet \
      --size Standard_DS1_v2  \
+     --vnet-name myVnet \
+     --subnet mySubnet \
      --image UbuntuLTS \
      --admin-username azureuser \
      --generate-ssh-keys \
@@ -113,4 +115,4 @@ In this tutorial, you learned how to:
 Advance to the next tutorial to learn about virtual machine scale sets.
 
 > [!div class="nextstepaction"]
-> [Create a virtual machine scale set](tutorial-create-vmss.md)
+> [Create a virtual machine scale set](tutorial-create-vmss.md)