[fc-cache] Remove obsolete sentence from man page

fc-cache/fc-cache.sgml

@@ -90,10 +90,7 @@ manpage.1: manpage.sgml
 
       <para>Note that <command>&dhpackage;</command> must be executed
         once per architecture to generate font information customized
-        for that architecture.  On a subsequent run,
-        <command>&dhpackage;</command> will augment the cache
-        information files with the information for the new
-        architecture. </para>
+        for that architecture.</para>
 
   </refsect1>
   <refsect1>