Add clarification that database field depends on the security event

Author: renetapopova

modules/ROOT/pages/monitoring/logging.adoc

@@ -727,6 +727,7 @@ The following information is available in the JSON format:
 
 | database
 | The database name the command is executed on.
+This field depends on the security event.
 
 | username
 | The user connected to the security event.