[release-notes] Use "desktop" instead of "shell"

[Link Dupont <link src gnome org>]

commit c5e7db05dd65334c118309c155f212412109f311
Author: Link Dupont <link sub-pop net>
Date:   Tue Sep 8 21:48:06 2020 -0400

    Use "desktop" instead of "shell"

 help/C/index.page | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/help/C/index.page b/help/C/index.page
index 71fa1d6c..b38f482f 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -51,7 +51,7 @@
     <title>New Welcome Tour</title>
     <p>GNOME 3.38 comes with a new <app>Welcome</app> tour, shown at first
     login, after the initial setup. The tour primarily highlights the main
-    functionality of the Shell, giving first time users a nice welcome to
+    functionality of the desktop, giving first time users a nice welcome to
     GNOME.</p>
     <media type="image" src="figures/welcome-tour.png">Welcome tour</media>
     <p>The <app>Welcome</app> tour is written in Rust.</p>