[release-notes] add multitasking screenshot

[Link Dupont <link src gnome org>]

commit 687ca7a78016444a909a1c14d1ade72b156433bc
Author: Link Dupont <link sub-pop net>
Date:   Tue Aug 31 15:03:00 2021 -0400

    add multitasking screenshot

 help/C/figures/multitasking.png | Bin 0 -> 65533 bytes
 help/C/index.page               |   1 +
 2 files changed, 1 insertion(+)
---
diff --git a/help/C/figures/multitasking.png b/help/C/figures/multitasking.png
new file mode 100644
index 00000000..635417be
Binary files /dev/null and b/help/C/figures/multitasking.png differ
diff --git a/help/C/index.page b/help/C/index.page
index 75b5f8d3..c899868a 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -100,6 +100,7 @@ xmlns:e="http://projectmallard.org/experimental/"; type="guide" id="index">
 
   <section id="multitasking">
     <title>Multitasking</title>
+    <media type="image" src="figures/multitasking.png"/>
 
     <p>The new <gui>Multitasking</gui> section in <app>Settings</app> enables users
     to customize common multitasking options related to window switching,