Re: master 49192e9: Strip "(fn...)" from output of `describe-mode' (bug#38222)

[Stefan Monnier]

> help-split-fundoc returns nil if the docstring has no usage string.
>
> (help-split-fundoc (documentation 'auto-composition-mode)
> 'auto-composition-mode) => nil

IIRC you can use

    (let* ((doc (documentation NAME))
           (fd (help-split-fundoc doc NAME)))
      (if fd (cdr fd) doc))

But I agree that `help-split-fundoc` is inconvenient.
Improvements welcome.  Maybe it should always return a pair (USAGE
. DOC) so we could just do:

    (cdr (help-split-fundoc (documentation NAME) NAME)


-- Stefan