[totem/mallard-documentation] Remove empty Extra Features section

[Andre Klapper <aklapper src gnome org>]

commit d94af289dc211f9e93e4828c5dfd9d8c5feda17e
Author: Andre Klapper <a9016009 gmx de>
Date:   Fri Jan 11 23:23:25 2019 +0100

    Remove empty Extra Features section

 help/C/index.page | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/help/C/index.page b/help/C/index.page
index c974531e..8a54904c 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -44,10 +44,6 @@
     <title>Advanced options</title>
   </section>
 
-  <section id="extra-features" style="2column">
-    <title>Extra features</title>
-  </section>
-
   <section id="troubleshooting" style="2column">
     <title>Troubleshooting</title>
   </section>