Update guest-configuration.md

Author: mgreenegit

articles/governance/policy/concepts/guest-configuration.md

@@ -15,7 +15,7 @@ extension and client. The extension, through the client, validates settings such
 - Environment settings
 
 At this time, most Azure Policy Guest Configuration policies only audit settings inside the machine. They don't
-apply configurations. The exception is [referenced below](#applying-configurations-using-guest-configuration).
+apply configurations. The exception is one built-in policy [referenced below](#applying-configurations-using-guest-configuration).
 
 ## Extension and client