bug#62673: 28.2; The example in "(elisp) Prefix Keys" is wrong

[Eli Zaretskii]

> Date: Wed, 05 Apr 2023 14:43:43 +0800
> From:  Lin Jian via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> Reproducing steps:
> 1. emacs -Q
> 2. eval the example in the *scratch* buffer
>   2.1. (use-local-map (make-sparse-keymap))
>            => nil ;; good
>   2.2. (local-set-key "\C-p" ctl-x-map)
>            => (keymap ...) ;; bad: manual says it returns nil
>   2.3. (key-binding "\C-p\C-f")
>            => find-file ;; good
>   2.4. (key-binding "\C-p6")
>            => 2C-command ;; bad: manual says it returns nil

That section was meanwhile rewritten (with new exciting mistakes).