add or update See www.boost.org comments

[SVN r16708]

include/boost/cstdint.hpp

@@ -6,7 +6,7 @@
 //  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/integer for documentation.
 
 //  Revision History
 //   31 Oct 01  use BOOST_HAS_LONG_LONG to check for "long long" (Jens M.)