Fix the NIC Names Command

The AZ CLI command to fetch the NIC names from the Backend Address Pool is incorrect. the current command generates 'Nones'. The command has been corrected now.

Author: vnextcoder

articles/virtual-machines/linux/tutorial-load-balancer.md

@@ -284,7 +284,7 @@ az network lb address-pool show \
     --lb-name myLoadBalancer \
     --name myBackEndPool \
     --query backendIpConfigurations \
-    --output tsv | cut -f4
+    --output tsv | cut -f5
 ```
 
 The output is similar to the following example, which shows that the virtual NIC for VM 2 is no longer part of the backend address pool: