tweaks to code

Author: asudbring

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

@@ -50,7 +50,7 @@ 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 \