tweaks to code

Author: asudbring

articles/load-balancer/scripts/load-balancer-linux-cli-sample-zone-redundant-frontend.md

@@ -45,7 +45,7 @@ This Azure CLI script example creates everything needed to run several Ubuntu vi
 
   # Create an Azure Load Balancer.
    az network lb create \
-    --resource-group myResourceGroupLB \
+    --resource-group myResourceGroup \
     --name myLoadBalancer \
     --public-ip-address myPublicIP \
     --frontend-ip-name myFrontEndPool \