bug#65270: 30.0.50; `describe-function' issue with some methods

[Stefan Monnier]

> It seems there is an issue with `describe-function' of a method that
> calls `cl-call-next-method'.  For a such method `describe-function' says
> that the method is "Undocumented" even if a doc string is present.

I pushed a patch to `master` which seems to fix this problem.

> Also the mentioned signature is weird.  See an illustration below using
> a simple recipe, running 'emacs -Q'.

I think we still have a problem here when the method is not
byte-compiled, but I think the problem is in `help-function-arglist`
which decides to use the "raw arglist" from the interpreted closure
without looking at the arg names stashed in the docstring.


        Stefan