Update PULL_REQUEST_TEMPLATE.md

Author: alexluckett

.github/PULL_REQUEST_TEMPLATE.md

@@ -11,7 +11,7 @@
   If you have consulted with the Defra Forms team prior to implementation, they will have provided you with an Azure DevOps work item number or (preferably) a link. Please include this.
 -->
 
-Azure DevOps work item:
+Jira ticket: 
 
 ## Type of change