[gtkmm] A slight deprecation docs improvement.

[Murray Cumming <murrayc src gnome org>]

commit d7e844c1291e13fef224f764805dd2cd7bf1afa5
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Jul 22 12:45:32 2013 +0200

    A slight deprecation docs improvement.

 gtk/src/button.hg |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/src/button.hg b/gtk/src/button.hg
index 7d74187..0479115 100644
--- a/gtk/src/button.hg
+++ b/gtk/src/button.hg
@@ -73,7 +73,7 @@ public:
   /** Creates a new Button containing the image and text from a stock item.
    * Stock ids have identifiers like Gtk::Stock::OK and Gtk::Stock::APPLY.
    * @param stock_id The stock item.
-   * @deprecated Use the constructor that takes a Glib::ustring instead.
+   * @deprecated Use the constructor that takes a Glib::ustring label instead because stock IDs are now 
deprecated.
    */
   explicit Button(const StockID& stock_id);
 #endif //GTKMM_DISABLE_DEPRECATED