Calling `describe-function' on a noninteractive non-byte-compiled
function produces an ungrammatical sentence in the *Help* buffer:

0. emacs -Q
1. Load a non-byte-compiled file that contains a noninteractive function
   definition, e.g. edt-user.el from the Emacs "etc" directory.
2. Call `describe-function' on a noninteractive function from that file,
   e.g. `C-h f edt-setup-user-bindings RET'.
==> The *Help* buffer now begins with this sentence:

edt-setup-user-bindings is a interpreted-function in
‘~/src/emacs/emacs-master/etc/edt-user.el’.

It should say "...is an interpreted-function...".

Here are three possible fixes: