add or update See www.boost.org comments

[SVN r16708]

include/boost/io_fwd.hpp

@@ -5,7 +5,7 @@
 //  in all copies.  This software is provided "as is" without express or
 //  implied warranty, and with no claim as to its suitability for any purpose.
 
-//  See http://www.boost.org for most recent version including documentation.
+//  See http://www.boost.org/libs/io for documentation.
 
 #ifndef BOOST_IO_FWD_HPP
 #define BOOST_IO_FWD_HPP