docs(emacs-lisp): remove sharp-quoted example for add-hook!
docs(emacs-lisp): remove sharp-quoted example for add-hook!

add-hook! is advertised to be able to add multiple hooks using a
function-quoted list of functions, but add-hook! never actually
supported this. Rather than correct the implementation, I'm correcting
the documentation instead, because sharp-quoting lists betrays the
semantics of the sharp-quote. Quoted lists should still work fine
though (as documented in add-hook!'s docstring).

Close: #5843

hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/doom-emacs