Merge pull request #4659 from ianabels/patch-20

Adding trigger event type

_docs/_user_guide/engagement_tools/campaigns/building_campaigns/delivery_types/triggered_delivery.md

@@ -30,6 +30,7 @@ Select a trigger event. This can include any of the following:
 - Performing the campaign's primary conversion event
 - Performing the exception event for another campaign
 - Adding an email address to a user profile
+- Updating a Subscription Group Status
 
 You can also further filter trigger events through Braze's [custom event properties][32], allowing for customizable event properties for custom events and in-app purchases. This feature allows you to further tailor which users receive a message based on the specific attributes of the custom event, allowing for greater campaign personalization and more sophisticated data collection.