TYPE_VFIELD documentation

[Richard Kenner]

    You should be able to do the same thing with TYPE_METHOD to learn more 
    about it.

Sure, and I indeed I did do these things, but the purpose of documentation
is so that people shouldn't have to!

Note that this sort of investigation is not enough to me able to
update the documentation, since all it yields is what *is* being done,
but the documentation is instead about what is *supposed* tobe done.