[AD] Tiny docs patch

[Eric Botcazou <ebotcazou@xxxxxxxxxx>]

One can still find new things after years of use...

Applied to mainline and branch.

-- 
Eric Botcazou

Index: docs/src/allegro._tx
===================================================================
RCS file: /cvsroot/alleg/allegro/docs/src/allegro._tx,v
retrieving revision 1.190
diff -u -r1.190 allegro._tx
--- docs/src/allegro._tx	22 Oct 2003 13:49:20 -0000	1.190
+++ docs/src/allegro._tx	23 Oct 2003 05:52:25 -0000
@@ -8260,7 +8260,7 @@
    the focus). It interprets user input and dispatches messages as they are 
    required, until one of the dialog procedures tells it to close the 
    dialog, at which point it returns the index of the object that caused it 
-   to exit.
+   to exit, or until ESC is pressed, at which point it returns -1.
 
 @@int @popup_dialog(DIALOG *dialog, int focus_obj);
 @xref do_dialog