Update comment for OCaml 4.02.0.
Update comment for OCaml 4.02.0.

dsheets/ocaml-ctypes,ocamllabs/ocaml-ctypes,sjfloat/ocaml-ctypes,fdopen/ocaml-ctypes,sjfloat/ocaml-ctypes,yallop/ocaml-ctypes,yallop/ocaml-ctypes,whitequark/ocaml-ctypes,ocamllabs/ocaml-ctypes,sjfloat/ocaml-ctypes,fdopen/ocaml-ctypes,fdopen/ocaml-ctypes,whitequark/ocaml-ctypes,dsheets/ocaml-ctypes,dsheets/ocaml-ctypes,whitequark/ocaml-ctypes