Update front-door-faq.md

Portal does not have the FDID field yet

Author: teresayao

articles/frontdoor/front-door-faq.md

@@ -93,7 +93,7 @@ To lock down your application to accept traffic only from your specific Front Do
     > [!WARNING]
     > Front Door's backend IP space may change later, however, we will ensure that before that happens, that we would have integrated with [Azure IP Ranges and Service Tags](https://www.microsoft.com/download/details.aspx?id=56519). We recommend that you subscribe to [Azure IP Ranges and Service Tags](https://www.microsoft.com/download/details.aspx?id=56519) for any changes or updates.
 
--    Perform a GET operation on your Front Door with the API version `2020-01-01` or higher. The same operation can also be done by referring your Front Door profile in Azure portal. In the 'Overview' section in Azure portal, you will see a field named *Front Door ID" and in the API call this field is called `frontdoorID`. Filter on the incoming header '**X-Azure-FDID**' sent by Front Door to your backend with the value as that of the field `frontdoorID`. 
+-    Perform a GET operation on your Front Door with the API version `2020-01-01` or higher. In the API call, look for `frontdoorID` field. Filter on the incoming header '**X-Azure-FDID**' sent by Front Door to your backend with the value as that of the field `frontdoorID`. 
 
 ### Can the anycast IP change over the lifetime of my Front Door?