[zenity] help: Remove duplicated license info in index page

[Andre Klapper <aklapper src gnome org>]

commit 0c4e13a56fbb28f2aa70cac67e51cd6a388c1fdd
Author: Andre Klapper <aklapper wikimedia org>
Date:   Sat Sep 7 15:16:44 2019 +0200

    help: Remove duplicated license info in index page
    
    ...so the page actually validates.

 help/C/index.page | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/help/C/index.page b/help/C/index.page
index 50e5d7e..b407c64 100644
--- a/help/C/index.page
+++ b/help/C/index.page
@@ -16,9 +16,11 @@
     <name>Yasumichi Akahoshi</name>
     <email>yasumichi vinelinux org</email>
   </credit>
+<!--
   <license>
    <p>GNU Free Documentation License (GFDL)</p>
   </license>
+-->
    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"; />
 </info>
 <title>Zenity Manual</title>