Domain name typo fix

src/FreeOberon.Mod

@@ -802,7 +802,7 @@ BEGIN w := OV.NewWindow(); w.modal := TRUE; w.caption := 'About';
   L := OV.NewLabel('Copyright (c) 2017-2021 by'); L.align := OV.center;
   L.do.resize(L, 1, Y, W - 2, 1); OV.Add(w, L); INC(Y, 2);
 
-  L := OV.NewLabel('Arthur Yefimov, free.oberon.su'); L.align := OV.center;
+  L := OV.NewLabel('Arthur Yefimov, free.oberon.org'); L.align := OV.center;
   L.do.resize(L, 1, Y, W - 2, 1); OV.Add(w, L); INC(Y, 2);
 
   b := OV.NewButton('O&K'); b.default := TRUE;