bug#39631: Mention how to remove entire keymaps in Your Init File

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson
>  <jidanni@jidanni.org>
> Date: Sun, 16 Feb 2020 12:14:41 +0800
> 
> There are insufficient instructions and examples in
> 
> Info 49.3.6 Rebinding Keys in Your Init File
> 
> as of emacs-version "26.3"
> 
> to allow the user to get rid of e.g., (seen with C-h b)
> C-,           flyspell-goto-next-error
> C-.           flyspell-auto-correct-word
> C-;           flyspell-auto-correct-previous-word
> C-c $         flyspell-correct-word-before-point
> 
> Leaving only
> C-M-i         flyspell-auto-correct-word
> 
> The user tries everything

I think there's a limit to what we can say in the user manual that
describes Lisp facilities.  Users who are serious about key-binding
customizations should read the ELisp manual to augment and complement
what is in the user manual.