bug#67939: 29.1.90; Broken links to Freedesktop notification spec

[Eli Zaretskii]

> Cc: Michael Albinus <michael.albinus@gmx.de>
> Date: Wed, 20 Dec 2023 19:19:16 +0100
> From:  "Basil L. Contovounesios" via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> The old links are broken, but is the new one in the patch too long?
> Is this suitable for emacs-29?

Documentation changes, especially where the current text is simply
wrong, are always welcome on the release branch.

Thanks.