bug#42296: 27.0.91; Correct manual entry for 'concat' w.r.t. allocation [PATCH]

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Sat, 11 Jul 2020 15:16:24 +0200
> Cc: 42296-done@debbugs.gnu.org
> 
> Thank you -- correction applied, and result pushed to master (by mistake) and 
> then to emacs-27.

Thanks.

Next time you have to do something like this, use "git cherry-pick -x"
to bring commits from master to the release branch, since that helps
merging in the opposite direction (I think the way you did it might
cause merge conflicts).