PR#6257: allow full doc comments on variant constructors and record fields

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14343 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
update Changes for PR#6257

git-svn-id: http://caml.inria.fr/svn/ocaml/trunk@14344 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02