Small grammar fix on alerting rules doc
@@ -101,5 +101,5 @@ on top of the simple alert definitions. In Prometheus's ecosystem, the
role. Thus, Prometheus may be configured to periodically send information about
alert states to an Alertmanager instance, which then takes care of dispatching
the right notifications.
-Prometheus can be [configured](configuration.md) to automatically discovered available
+Prometheus can be [configured](configuration.md) to automatically discover available
Alertmanager instances through its service discovery integrations.
