Shut up Emacs 29's byte-compiler (#404)

* Shut up Emacs 29's byte-compiler

* Fix docstring to comply with checkdoc

Author: leungbk

src/top/utop.el

@@ -1236,8 +1236,8 @@ Special keys for utop:
 (declare-function company-begin-backend "ext:company")
 (declare-function company-grab-symbol-cons "ext:company")
 
-(defun utop-company-backend (command &optional _arg &rest ignored)
-  "company backend for utop completions"
+(defun utop-company-backend (command &optional _arg &rest _ignored)
+  "Perform an action determined by COMMAND."
   (interactive (list 'interactive))
   (pcase command
     ('interactive (company-begin-backend 'utop-company-backend))