Update gpo-designated-receiver.md (#587)

Adding a note for Designated receivers to reach out directly to Team Ada if they observe any unusual behavior with the GPO letter that may require immediate attention.

Co-authored-by: tahineemay <[email protected]>

_articles/gpo-designated-receiver.md

@@ -34,6 +34,10 @@ It takes 3-7 business days for letters to arrive. It is common to not receive an
 
 If you'd like to volunteer to receive and record letters, please add your name to the [Upcoming Volunteers tab][upcoming-volunteers] of the GPO Designated Receiver Report spreadsheet. If you have any questions about the process, you can ask them in Slack in [#login-team-ada][team-ada-slack].
 
+## Please: See something, say something!
+
+Please make sure to record any unusual behavior observed with the letter on the Notes column of the [spreadsheet][the-spreadsheet]. If you believe the issue requires immediate attention, please post on #login-team-ada and tag @login-oncall-ada.
+
 ## How to change the designated receiver
 
 Team Ada's oncall engineer updates the designated receiver configuration on (or around) the 15th of every month. Here's the process:
@@ -70,4 +74,4 @@ Please ping the new designated receiver in Slack and let them know that they sho
 [upcoming-volunteers]: https://docs.google.com/spreadsheets/d/1fgRrwNk5GJZbs68Y9JFa4WbmH5OAUKkVrfjNetEh1TY/edit#gid=1451916214
 [app-s3-secret]: /articles/devops-scripts.html#app-s3-secret
 [team-ada-slack]: https://gsa.enterprise.slack.com/archives/CNCGEHG1G
-[config-recycle]: /articles/appdev-deploy.html#config-recycle
+[config-recycle]: /articles/appdev-deploy.html#config-recycle