[gtk+] Improve GtkMenuPositionFunc docs

[Matthias Clasen <matthiasc src gnome org>]

commit 597a24edf643dd3f1f4402ef4798d2aaf621007a
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat May 30 23:26:37 2009 -0400

    Improve GtkMenuPositionFunc docs
    
    Add a note about gtk_menu_set_monitor().
---
 docs/reference/gtk/tmpl/gtkmenu.sgml |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/docs/reference/gtk/tmpl/gtkmenu.sgml b/docs/reference/gtk/tmpl/gtkmenu.sgml
index 96bd4b4..20d2c20 100644
--- a/docs/reference/gtk/tmpl/gtkmenu.sgml
+++ b/docs/reference/gtk/tmpl/gtkmenu.sgml
@@ -449,6 +449,8 @@ Returns the #GtkWidget that the menu is attached to.
 A user function supplied when calling gtk_menu_popup() which controls the
 positioning of the menu when it is displayed.  The function sets the @x
 and @y parameters to the coordinates where the menu is to be drawn.
+To make the menu appear on a different monitor than the mouse pointer,
+gtk_menu_set_monitor() must be called.
 </para>
 
 @menu: a #GtkMenu.