TASK-5958: add suppression list clarity to unsubscribe documentation (#789)

Author: rafaelmatsumotomb

content/docs/user-guide/setting-up-unsubscribe-links.md

@@ -24,7 +24,7 @@ For the plain text part, use the following format:
 http://www.yourdomain.com[[data-msys-unsubscribe="1"]]
 ```
 
-That's it. When users click on this link to unsubscribe, your webhook consumer will receive a `link_unsubscribe` event.
+That's it. When users click on this link to unsubscribe, your webhook consumer will receive a `link_unsubscribe` event. SparkPost will automatically add the recipient's email address to your suppression list.
 
 ### List Unsubscribe Example
 

content/docs/user-guide/using-unsubscribe-reports.md

@@ -18,7 +18,7 @@ To use the link unsubscribe, simply add a link in your email in the following fo
    title="USEFUL_NAME">UNSUBSCRIBE_LINK_DISPLAY_NAME</a>
 ```
 
-That's it. When users click on this link to unsubscribe, your webhook consumer will receive a `link_unsubscribe` event.
+That's it. When users click on this link to unsubscribe, your webhook consumer will receive a `link_unsubscribe` event. SparkPost will automatically add the recipient's email address to your suppression list.
 
 ### List Unsubscribe Example: