Add a missing </sect3>.

diff --git a/documentation/configuring.sgml b/documentation/configuring.sgml
index 43ef0db..4585be0 100644
--- a/documentation/configuring.sgml
+++ b/documentation/configuring.sgml
@@ -484,6 +484,8 @@
           still have this in your <filename>wine.conf</filename> or
           <filename>~/.wine/config</filename>, you may safely delete it.
           </para>
+	</sect3>
+
         <sect3>
           <title>The [DllOverrides] Section</title>
           <para>