Update events.md

Author: oblomov-dev

docs/development/events.md

@@ -40,7 +40,7 @@ METHOD z2ui5_if_app~main.
  
     CASE client->get( )-event.
       WHEN 'BUTTON_POST'.
-        client->message_box_display( |The button text is { client->get_event_arg( ) }| ).
+          client->message_box_display( |The button text is { client->get_event_arg( ) }| ).
     ENDCASE.
  
 ENDMETHOD.