fix broken link in index-kvx.html

doc/index-kvx.html

@@ -278,7 +278,7 @@ This IR is generic over the processor, even if currently, only used for KVX.
   </TD>
   <TD>RTL to RTL</TD>
   <TD><A HREF="html/compcert.backend.Duplicate.html">Duplicate</A> (generic checker)</TD>
-  <TD><A HREF="html/compcert.scheduling.Duplicateproof.html">Duplicateproof</A> (generic proof)<BR>
+  <TD><A HREF="html/compcert.backend.Duplicateproof.html">Duplicateproof</A> (generic proof)<BR>
     <a href="html/compcert.backend.Duplicatepasses.html">Duplicatepasses</a> (several passes from several oracles)</TD>
 </TR>
 <TR valign="top" style="color:#000000">