doc: improve audit log doc

manual/docs/04-guides/17-audit-logs.mdx

@@ -35,12 +35,13 @@ Page top section allows filtering displayed actions based on several criteria, s
 
 <img src={searchForm} />
 
-
 <Note>
 When using search, current criteria will be stored in URL.<br/>
 Therefore, you can easily share search results by sharing the current URL.
 </Note>
 
+You can search actions concerning deleting users / flags by typing their usernames / IDs directly in search form selects.
+
 ## Log retention
 
 Audit log retention duration is configured by the [app.audit.events-hours-ttl parameter](./configuration#Audit) parameter.