String freeze break request for gnome-shell

[Florian Müllner <fmuellner gnome org>]

Hey!

I'd like to push a minor string change in
https://gitlab.gnome.org/GNOME/gnome-shell/issues/1538.

The change is in the --help output of the newly-added gnome-extensions
CLI tool and very simple:
"Use %s to get detailed help.\n" becomes
"Use “%s” to get detailed help.\n" (note the quotation marks around %s).

It is not very important to get the change into 3.34.1, but Piotr
suggested asking for a freeze break, so here we are :-)

Cheers,
Florian