update releases link in plat.html to 4.6

Index: plat.html
===================================================================
RCS file: /cvs/www/plat.html,v
retrieving revision 1.104
diff -u -p -r1.104 plat.html
--- plat.html	9 Sep 2009 22:28:11 -0000	1.104
+++ plat.html	19 Oct 2009 23:58:06 -0000
@@ -28,7 +28,7 @@ OpenBSD is officially supported on the f
 Official support means that the release install media is known
 to work, that the architecture can self-compile itself, and
 that most of the basic tools exist on the architecture.
-As well, <a href="45.html">releases</a> always exist, and
+As well, <a href="46.html">releases</a> always exist, and
 there are attempts to make <a href="ftp.html">snapshots</a>
 available on a regular basis.
 </td>