[gtkmm] MenuShell: Removed documentation references about Menu_Helpers::MenuElem

[Murray Cumming <murrayc src gnome org>]

commit 6a5d390fc464540d226683038e93f4b0db1f2415
Author: Kalev Lember <kalev smartlink ee>
Date:   Sat Mar 19 16:13:24 2011 +0200

    MenuShell: Removed documentation references about Menu_Helpers::MenuElem
    
    * gtk/src/menushell.hg: Removed references to
    Gtk::Menu_Helpers::MenuElem which is no longer available in gtkmm 3.0.

 gtk/src/menushell.hg |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/gtk/src/menushell.hg b/gtk/src/menushell.hg
index 88fd8a9..a8b8a28 100644
--- a/gtk/src/menushell.hg
+++ b/gtk/src/menushell.hg
@@ -37,8 +37,7 @@ class Window;
 /** The abstract base class for Gtk::Menu and Gtk::MenuBar.
  * It is a container of Gtk::MenuItem objects arranged in a list which can be navigated, selected, and activated by the user to perform application functions.
  * It can have a submenu associated with it, allowing for nested hierarchical menus.
- * You can use append(), prepend() and insert() to add Gtk::MenuItem widgets,
- * but you will probably find it more convenient to use the STL-style items() interface with the Gtk::Menu_Helpers::MenuElem() class.
+ * Use append(), prepend() and insert() to add Gtk::MenuItem widgets.
  * @ingroup Widgets
  * @ingroup Containers
  * @ingroup Menus