add image explaining privatelink dns

Author: kbrwn

pages/authzed/guides/setting-up-private-networking.mdx

@@ -55,6 +55,10 @@ Navigate to the Endpoint that was just created, select `Actions` from the drop-d
 
 Check `Enable for this endpoint` and then click `Save changes` to persist this setting.
 
+The diagram below explains how DNS resolution works with PrivateLink and AuthZed Dedicated.
+
+![privatelink-dns](/images/privatelink-dns.png)
+
 ### Create a Permissions System
 
 You can skip this section if you've already created a Permissions System.