add example

Author: MekaylaMoore

articles/expressroute/gateway-migration-error-messaging.md

@@ -47,7 +47,7 @@ These scenarios include solutions to prevent failures and ensure a successful mi
 
 | Error name | Message | Resolution |
 |------------|---------|------------|
-| **Insufficient gateway subnet size** | Virtual network `{vnetName}` doesn't have sufficient space for deploying another gateway. | Delete and recreate the GatewaySubnet as a /27 or smaller prefix. For guidance, see [Delete and recreate a subnet](../virtual-network/virtual-network-manage-subnet.md). |
+| **Insufficient gateway subnet size** | Virtual network `{vnetName}` doesn't have sufficient space for deploying another gateway. | Delete and recreate the GatewaySubnet as a /27 or shorter prefix (for example, /26 or /25). For guidance, see [Delete and recreate a subnet](../virtual-network/virtual-network-manage-subnet.md). |
 | **Legacy connection mode** | The ExpressRoute connections linked to the gateway were created before 2017 (Legacy mode). | Delete and recreate all connections before initiating migration. For detailed steps, see [Convert legacy ExpressRoute gateway connections](howto-recreate-connections.md). |
 | **Incompatible dedicated circuit** | Gateway migration can't proceed due to a dedicated Hardware Security Module (HSM) connected to the virtual network. | To proceed with the migration, deallocate the dedicated Hardware Security Module (HSM). For detailed troubleshooting steps, see [Troubleshoot Dedicated HSM](/azure/dedicated-hsm/troubleshoot). |
 | **Resources in failed state** | The **validate** stage fails if the gateway or any connected resource, such as circuits, connections, public IPs, VNets, or GatewaySubnet, is in a failed state. | Verify that all resources are in a succeeded state before initiating the migration process. For more information, see [Troubleshoot failed state](../networking/troubleshoot-failed-state.md).|