migration guide example (Network cmdlet)

Author: henry416

documentation/release-notes/migration-guide.4.0.0.md

@@ -179,6 +179,14 @@ The following cmdlets were affected this release:
 ### New-AzureRmVirtualNetworkGatewayConnection
 - `EnableBgp` parameter has been changed to take a `boolean` instead of a `string`
 
+```powershell
+# Old
+New-AzureRmVirtualNetworkGatewayConnection -ResourceGroupName "RG" -name "conn1" -VirtualNetworkGateway1 $vnetGateway -LocalNetworkGateway2 $localnetGateway -ConnectionType IPsec -SharedKey "key" -EnableBgp "true"
+
+# New
+New-AzureRmVirtualNetworkGatewayConnection -ResourceGroupName "RG" -name "conn1" -VirtualNetworkGateway1 $vnetGateway -LocalNetworkGateway2 $localnetGateway -ConnectionType IPsec -SharedKey "key" -EnableBgp $true
+```
+
 ## Breaking changes to ServiceBus cmdlets
 
 The following cmdlets were affected this release: