Fix duplicate H2 warning by moving tab selector before resource group heading

Author: asudbring

articles/virtual-network/ip-services/configure-routing-preference-virtual-machine.md

@@ -43,10 +43,10 @@ If you choose to install and use PowerShell locally, this article requires the A
 
 ---
 
-## Create a resource group
-
 # [Azure portal](#tab/azure-portal)
 
+## Create a resource group
+
 1. Sign in to the [Azure portal](https://portal.azure.com).
 
 2. In the portal search box, enter **Resource groups**. In the search results, select **Resource groups**.