Update events.yml

Author: dawnaitken

_data/events.yml

@@ -66,5 +66,5 @@
     start-date: 2025-05-19
     dates: May 19-23, 2025
     url: https://event.checkin.no/82562/ndc-oslo-2025?action=campaignInvite&campaignInviteHash=ZGF3bi5haXRrZW5Ab3dhc3AuY29t&campaignInviteId=4927
-    optional-text: Above link is for discounted tickets 
+    optional-text: Be sure to use the link above for discounted tickets.