[gtkmm-documentation] Fix a broken link to www.gtkmm.org

[Kjell Ahlstedt <kjellahl src gnome org>]

commit b8882ee53a86ab0be83c04dc3da76f6f360b4f40
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Thu May 31 16:51:58 2018 +0200

    Fix a broken link to www.gtkmm.org
    
    Fixes #2

 docs/tutorial/C/index-in.docbook | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/tutorial/C/index-in.docbook b/docs/tutorial/C/index-in.docbook
index d8eedf1..78b312d 100644
--- a/docs/tutorial/C/index-in.docbook
+++ b/docs/tutorial/C/index-in.docbook
@@ -8025,7 +8025,7 @@ any aspect of &gtkmm; that does not already have documentation, please
 consider contributing to this document.
 </para>
 <para>
-Ideally, we would like you to <ulink url="http://www.gtkmm.org/bugs.shtml";>provide a patch</ulink> to the
+Ideally, we would like you to <ulink url="http://www.gtkmm.org/en/bugs.shtml";>provide a patch</ulink> to the
 <filename>docs/tutorial/C/index-in.docbook</filename> file. This file is currently
 in the <literal>gtkmm-documentation</literal> module in GNOME git.
 </para>