Switch docstrings for bigarray_of_array and array_of_bigarray.
Switch docstrings for bigarray_of_array and array_of_bigarray.

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