Bug 1496890 - include client calling triggerHook in action description r=aki

Differential Revision: https://phabricator.services.mozilla.com/D16875

--HG--
extra : moz-landing-system : lando

.taskcluster.yml

@@ -38,7 +38,10 @@ tasks:
                 $if: 'tasks_for == "action"'
                 then:
                   name: "Action: ${action.title}"
-                  description: '${action.description}'
+                  description: |
+                      ${action.description}
+                      
+                      Action triggered by clientID `${clientId}`
                 else:
                   name: "Decision Task for cron job ${cron.job_name}"
                   description: 'Created by a [cron task](https://tools.taskcluster.net/tasks/${cron.task_id})'