update Changes

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15671 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
PR#6560: Wrong failure message for {Int32,Int64,NativeInt}.of_string

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@15672 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02