Update documentation for DEFCTYPE.
Update documentation for DEFCTYPE.

dochang/cffi,marsijanin/cffi,attila-lendvai/cffi,stassats/cffi,dkochmanski/cffi,marsijanin/cffi,akovalenko/cffi,3b/cffi,cffi/cffi,cffi/cffi,marsijanin/cffi,dochang/cffi,dochang/cffi,mcna/cffi,kingcheez/cffi-cheez,stassats/cffi,dkochmanski/cffi,kingcheez/cffi-cheez,mcna/cffi,kingcheez/cffi-cheez,akovalenko/cffi,akovalenko/cffi,wesen/cffi,stassats/cffi,dkochmanski/cffi,3b/cffi,wesen/cffi,wesen/cffi,attila-lendvai/cffi,3b/cffi,cffi/cffi