Add broadcast message related to 502 errors (#1416)

* Add broadcast message about tooling 502 errors

To notify users to upgrade to CDE NGINX images if
they are encountering 502 errors

* Fix typo

settings.yaml

@@ -93,7 +93,12 @@ CUSTOM_AUTH_CONNECTIONS: "auth0_nomis"
 AUTH0_NOMIS_GATEWAY_URL: "https://testing.com"
 
 
-BROADCAST_MESSAGE:
+BROADCAST_MESSAGE: >
+  We are currently rolling out additional releases to Analytical Platform Tooling (Jupyter
+  Lab All Spark, Jupyter Lab Data Science, and RStudio) that enables a new proxy (referred
+  to as CDE NGINX). If you experience a 502 Bad Gateway when trying to open a tool, please
+  deploy the CDE NGINX variant.
+
 
 GITHUB_VERSION: "2022-11-28"