Update upgrade-basic-standard-with-powershell.md

need to update to primary IP if using secondary IP for floating IP

Author: cozhang8

articles/load-balancer/upgrade-basic-standard-with-powershell.md

@@ -58,6 +58,7 @@ The PowerShell module performs the following functions:
 - Basic Load Balancers for [Azure Kubernetes Services (AKS) clusters](/azure/aks/load-balancer-standard#moving-from-a-basic-sku-load-balancer-to-standard-sku)
 - Basic Load Balancers with a Virtual Machine Scale Set backend pool member where one or more Virtual Machine Scale Set instances have ProtectFromScaleSetActions Instance Protection policies enabled
 - Migrating a Basic Load Balancer to an existing Standard Load Balancer
+- If your Basic Load Balancer has floating IP enabled on a secondary IP configuration of the network interface, update the floating IP to a primary IP before running the migration script to avoid any configuration issues
 
 ## Install the 'AzureBasicLoadBalancerUpgrade' module