bug#3566: 23.0.94; explain why not to use group defined by define-minor-mode

[Lars Ingebrigtsen <larsi@gnus.org>]

Lars Ingebrigtsen <larsi@gnus.org> writes:

>  :group GROUP	Custom group name to use in all generated `defcustom' forms.
>  		Defaults to MODE without the possible trailing \"-mode\".
> -		(This default may not be a valid customization group defined
> -		with `defgroup'.  Make sure it is.)
> +		Don't use this default group name unless you have written a
> +		`defgroup' to define that group properly.
>
> The previous version may have been clearer?  I think what it's trying to
> say is that if you have a :group, then you should make sure to add a
> defgroup to that symbol.

Actually, I think it's clear enough as it is without spelling out the
rationale behind this.

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