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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Add hints to documentation of car and cdr for (e)lisp newcomers -
 take 2
Date: Wed, 14 Jul 2021 18:50:28 +0300
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To: Adam =?utf-8?Q?Sj=C3=B8gren?= <asjo@koldfront.dk>
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In-Reply-To: <8735shrl57.fsf@tullinup.koldfront.dk> (message from Adam
 =?utf-8?Q?Sj=C3=B8gren?= on Wed, 14 Jul 2021 17:05:24 +0200)
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> From: Adam Sjøgren <asjo@koldfront.dk>
> Date: Wed, 14 Jul 2021 17:05:24 +0200
> 
> Or what about:
> 
>   ,----
>   | (car LIST)
>   | 
>   | Return the car of LIST, eg if LIST is '(a . b) return a.  If arg is nil, return nil.
>   `----
> 
>   ,----
>   | (cdr LIST)
>   | 
>   | Return the cdr of LIST, eg if LIST is '(a . b) return b.  If arg is nil, return nil.
>   `----

The doc string nowadays includes a pointer to the ELisp manual, where
you can find a description of what is 'car' and what is 'cdr'.  I
think that's "good enough".