bug#18296: 24.4.50; doc string of `whitespace-mode'

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

>> 1. Please mention which faces are used for which kinds of highlighting.
>
> Well, there's a lot of faces, and I think it's unusual for modes like
> this to enumerate them.  But perhaps a link to the customisation group
> would be nice?  Is there a syntax for that?

There wasn't, but I've now added it to Emacs 28, and I've also added a
link from the whitespace-mode doc string.

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