added Troubleshoot tile

Author: spelluru

articles/event-hubs/index.yml

@@ -165,3 +165,10 @@ landingContent:
           - text: Enable Virtual Networks integration and firewalls
             url: event-hubs-tutorial-virtual-networks-firewalls.md
 
+  # Card
+  - title: Troubleshoot
+    linkLists:
+      - linkListType: how-to-guide      
+        links:
+          - text: Troubleshoot exceptions
+            url: event-hubs-messaging-exceptions.md