development: adjust for monitor facility argument

Author: fichtner

source/development/backend/autorun.rst

@@ -37,7 +37,7 @@ They can contain any executable file (e.g. shell scripts) in the following subdi
 - import
     - run very early to allow overriding the opnsense-import functionality either by providing a /conf/config.xml beforehand or modifying the default import afterwards
 - monitor
-    - scripts run during monitoring alerts triggered by state transitions
+    - scripts run during monitoring alerts triggered by state transitions.  First argument is a comma-separated list of names of the affected gateways.
 - start
     - start script after system network startup
 - stop