The FIXME suggests that the documentation may be incorrect!
I am precisely trying to add multiple functions to one hook, and I can't work out how to do it with a single :hook clause. Is this in fact possible? The most obvious syntax, copying the syntax for adding a function to multiple hooks, does not work, e.g.:
(use-package foo-mode
:hook
(foo-mode . (function-a function-b)))
I tried other things, and searching online, and even looking at the source code for use-package, but I can't work it out. Hence, maybe a good chance to fix this FIXME in the docs, and explain to users how this is done, or state that it cannot be done, and you have to use another method to add multiple functions to a hook.
I have to say, use-package (which I have only now looked at) is a revelation!