[gnome-chess] Fix typo

[Andre Klapper <aklapper src gnome org>]

commit 3aad7b51b1e6486bf45b147a926f05d96a796330
Author: Andre Klapper <a9016009 gmx de>
Date:   Mon Feb 24 16:54:24 2014 +0100

    Fix typo

 help/C/index.docbook |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/index.docbook b/help/C/index.docbook
index 7acc884..46a9983 100644
--- a/help/C/index.docbook
+++ b/help/C/index.docbook
@@ -200,7 +200,7 @@ move time and buttons for showing previous or next moves are available.
 <sect2>
 <title>Starting a new game</title>
 <para>
-To start a new game, press the <guibutton>New Game</guibutton> buttton on the toolbar.
+To start a new game, press the <guibutton>New Game</guibutton> button on the toolbar.
 </para>
 </sect2>