[goobox] fixed a syntax error in the manual

[Paolo Bacchilega <paobac src gnome org>]

commit 75fd302d73045c15eb315ca8bcc369cfecd597d6
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Nov 21 20:41:51 2009 +0100

    fixed a syntax error in the manual

 help/C/goobox.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/goobox.xml b/help/C/goobox.xml
index 3fbd781..2dbfcef 100644
--- a/help/C/goobox.xml
+++ b/help/C/goobox.xml
@@ -164,7 +164,7 @@
         <listitem>
           <para>The audio files format to use.  
           Some formats allow you to set the quality of the file, this can be
-          usefull because usually there is a trade-off between audio quality 
+          useful because usually there is a trade-off between audio quality 
           and file size.
           Use the <guilabel>Properties</guilabel> button to set the file 
           format properties.