bug#63497: [PATCH] Remove obsolete information on archiving mail from Gnus manual

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 13 May 2023 21:28:37 +0200
> From:  Jens Schmidt via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> my first test patch to practice things, pls comment if its format is not 
> what you expect.  I hope Thunderbird does not mess up the format.  FSF 
> copyright assignment is in process, but probably not yet completed.

It's not.

> Regardless of this being a test patch, it fixes a real but minor doc 
> issue in the Gnus manual:  In 2012 Lars committed a change that removed 
> the previous "external marks" feature  from various backends 
> (89b163db286d79b43fb5c9927fc622bbf7d2ef1a).
> 
> The Gnus manual still references these external marks in section 
> "Archiving Mails", I guess that reference just got overlooked.  But 
> without external marks, archiving mails in Gnus is rather difficult (to 
> my knowledge), at least for the nnml backend.  So I decided to rather 
> remove that section entirely.

Andrew, should these parts be removed, indeed?

> * doc/misc/gnus.texi: Remove obsolete information on archiving mail from 
> Gnus manual

Please mention the names of the nodes in which you make the changes,
as if they were functions.  (Using the Emacs commands for generating
ChangeLog-style entries would automatically include those node names
for you, so it is recommended to use those commands.)

Also, once you know the bug number (which usually happens when you
submit the second version of the patch and all the subsequent
versions), please mention the bug number in the commit log message.
You can see examples of that if you type "git log" in the Emacs
repository.

Thanks.