PR#6274: allow doc comments on object types
(thanks to Thomas Refis)

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@14905 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
Changes: PR#6274

git-svn-id: http://caml.inria.fr/svn/ocaml/version/4.02@14906 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02