Put filterMessagesForRole's docblock back on filterMessagesForRole

The #920 guard landed between the comment and the function it describes.

src/Http/Controllers/TicketController.php

@@ -47,9 +47,6 @@ class TicketController extends Controller
             ->exists();
     }
 
-    /**
-     * Filter messages for submitters — strip internal notes.
-     */
     /**
      * REFUSE A WRITE TO A MERGED TICKET — [central-ticketing] #920.
      *
@@ -84,6 +81,9 @@ class TicketController extends Controller
             : redirect()->route('ticketing.show', $ticket)->withErrors($errors);
     }
 
+    /**
+     * Filter messages for submitters — strip internal notes.
+     */
     private function filterMessagesForRole($messages, bool $isAgent)
     {
         if ($isAgent) {