[gnome-shell] readme: Change "GNOME 3" to "GNOME"

[Marge Bot <marge-bot src gnome org>]

commit a8f1722a9f6b8f43737da74eee5d71eedecc71de
Author: Fionn Kelleher <self osslate net>
Date:   Wed Aug 11 14:41:15 2021 +0000

    readme: Change "GNOME 3" to "GNOME"
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1944>

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 523ff3ad7c..bf0d9aafa6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # GNOME Shell
-GNOME Shell provides core user interface functions for the GNOME 3 desktop,
+GNOME Shell provides core user interface functions for the GNOME desktop,
 like switching to windows and launching applications. GNOME Shell takes
 advantage of the capabilities of modern graphics hardware and introduces
 innovative user interface concepts to provide a visually attractive and