bug#55483: bad link

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson
>  <jidanni@jidanni.org>
> Date: Tue, 17 May 2022 22:42:28 +0800
> 
> On https://gnus.org/manual/gnus.html#Top there are links like
> https://gnus.org/message/index.html#Top
> which are broken.

This is not where we maintain the Gnus manual nowadays.  Please use
this URL:

   https://www.gnu.org/software/emacs/manual/html_node/gnus/index.html

Gnus is part of the Emacs distribution now, and is developed as part
of Emacs in the same Git repository, so its manual is now one of the
manuals that come with Emacs.