[docs] Mention va_list in the ARGIN/ARGOUT/ARGMOD documentation, as it's not always a pointer type.
[docs] Mention va_list in the ARGIN/ARGOUT/ARGMOD documentation, as it's not always a pointer type.

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@38907 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot,ashgti/parrot