Update digest-authentication.md

Author: mszixie

support/developer/webapps/iis/www-authentication-authorization/digest-authentication.md

@@ -9,7 +9,7 @@ ms.reviewer: atsushin, bariscag
 
 This article helps you resolve the problem where digest authentication fails when a client sends a request through a proxy to a site and Microsoft Internet Information Services (IIS) uses digest authentication.
 
-_Original product version:_   Internet Information Services 8.5, 8.0  
+_Original product version:_   Internet Information Services  
 _Original KB number:_   3050055
 
 ## Symptoms