fix achievement entry

Author: ceperezb

learn-pr/achievements.yml

@@ -7579,4 +7579,4 @@ achievements:
   type: badge 
   title: Describe Microsoft Entra Verified ID concepts
   summary: Learn the core concepts of decentralized identities and Microsoft Entra Verified ID.
-  iconUrl: /training/achievements/describe-verified-id-concepts.svg
+  iconUrl: /training/achievements/generic-badge.svg