[release-notes] Add section on drag to reorder apps

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 7e15d24576c531a093af4e94442238656f2a5eeb
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Thu Sep 3 17:39:45 2020 -0500

    Add section on drag to reorder apps

 help/C/index.page | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/help/C/index.page b/help/C/index.page
index 9db979db..cd5d0eb8 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -38,6 +38,13 @@
   Mexico, but had to be moved online due to the pandemic. We are very much
   looking forward to meeting in Mexico in the near future.</p>
 
+  <section>
+    <title>Drag to Reorder Apps</title>
+    <p>GNOME 3.38 replaces the split Frequent and All apps views with one
+    consistent view that allows you to order apps however you like. Simply click
+    and drag to move apps around.</p>
+  </section>
+
   <section>
     <title>New “Welcome” tour</title>
     <p>GNOME 3.38 comes with a new “Welcome” tour, which gets shown on first