Update docs

docs/error_monitoring_for_travel_advice_alerts.md

@@ -1,17 +1,11 @@
 # Error Monitoring for Travel Advice Alerts
 
-* An email alert monitoring script
-  * https://github.com/alphagov/email-alert-monitoring/
-  * This runs once every hour on the Production deploy server
-  * It checks https://www.gov.uk/api/foreign-travel-advice.json and
-    looks for all country updates within a specific window (from 2 days
-    ago to 1 hour ago)
-  * It then checks a dedicated inbox that has been subscribed to all
-    travel alerts
-  * If an expected update isn't present in the inbox, an urgent alert is
-    shown in Icinga
-  * This urgent alert triggers a phone call to the 2nd line/on called   
-    support team
+* Confirming email delivery
+  * a job runs every 15 mins in email-alert-api
+  * if it's an hour since a travel advice alert was created and no
+    emails have been delivered for that alert, the 2nd line/on call
+    team are paged.
+  * More details: https://github.com/alphagov/email-alert-api/blob/main/docs/alert_check_scheduled_jobs.md
 * Application error monitoring in Sentry
 * A healthcheck in `email-alert-api`
   * We use GOV.UK Notify to deliver emails