[glibmm] Updated a comment

[Murray Cumming <murrayc src gnome org>]

commit 60635afca8eee801e24633b91c713bd0a1b11561
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Oct 1 10:43:51 2013 +0200

    Updated a comment

 gio/src/menu.hg |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gio/src/menu.hg b/gio/src/menu.hg
index 14c3af8..69ae591 100644
--- a/gio/src/menu.hg
+++ b/gio/src/menu.hg
@@ -48,7 +48,7 @@ public:
 
   _WRAP_METHOD(void freeze(), g_menu_freeze)
 
-  //TODO: Make the item "const Glib::RefPtr<const MenuItem>&"? The function is documented as just copying 
its attributes.
+  //TODO: Make the item "const Glib::RefPtr<const MenuItem>&" when we can break ABI? The function is 
documented as just copying its attributes.
   _WRAP_METHOD(void insert_item(int position, const Glib::RefPtr<MenuItem>& item), g_menu_insert_item)
   _WRAP_METHOD(void prepend_item(const Glib::RefPtr<MenuItem>& item), g_menu_prepend_item)
   _WRAP_METHOD(void append_item(const Glib::RefPtr<MenuItem>& item), g_menu_append_item)