bug#43833: 28.0.50; gnus-use-backend-marks is never used in gnus, the manual should be updated

[Lars Ingebrigtsen]

Zhiwei Chen <condy0919@gmail.com> writes:

> In
> https://www.gnu.org/software/emacs/manual/html_node/gnus/Startup-Variables.html#Startup-Variables
>
> gnus-use-backend-marks
>     If non-nil, Gnus will store article marks both in the .newsrc.eld
> file and in the backends. This will slow down group operation some.
>
> But grepping `gnus-use-backend-marks' in gnus codebase shows no reference.

Yup; it was removed in 2011.  I've now removed the left-over mention in
the Gnus manual in Emacs 28.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no