Merge pull request #260435 from greg-lindsay/dns-upd

Add restriction - private IP addresses only RFC1918

Author: prmerger-automator[bot]

articles/dns/dns-private-resolver-overview.md

@@ -6,7 +6,7 @@ ms.custom: references_regions, ignite-2022
 author: greg-lindsay
 ms.service: dns
 ms.topic: overview
-ms.date: 11/27/2023
+ms.date: 12/05/2023
 ms.author: greglin
 #Customer intent: As an administrator, I want to evaluate Azure DNS Private Resolver so I can determine if I want to use it instead of my current DNS resolver service.
 ---
@@ -128,7 +128,7 @@ Outbound endpoints have the following limitations:
 - DNS private resolver does not support Azure ExpressRoute FastPath.
 - DNS private resolver inbound endpoint provisioning isn't compatible with [Azure Lighthouse](../lighthouse/overview.md).
     - To see if Azure Lighthouse is in use, search for **Service providers** in the Azure portal and select **Service provider offers**. 
-
+- DNS Private Resolver only supports [RFC1918](https://datatracker.ietf.org/doc/html/rfc1918) addresses.
 
 ## Next steps