Update alpha release notes to current.

doc/src/sgml/release-8.5.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/release-8.5.sgml,v 1.2 2009/08/18 16:54:12 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release-8.5.sgml,v 1.3 2009/08/19 07:54:21 petere Exp $ -->
 
 <sect1 id="release-8.5">
   <title>Release 8.5alpha1</title>
@@ -300,6 +300,11 @@
             contrib/dict_xsyn.
           </para>
         </listitem>
+        <listitem>
+          <para>
+            Added contrib/unaccent.
+          </para>
+        </listitem>
       </itemizedlist>
     </sect3>
     <sect3>