batman-adv: Switch to HTTPS version of links

open-mesh.org and its subdomains can only be accessed via HTTPS. HTTP-only
requests are currently redirected automatically to HTTPS but references in
the source code should be only https.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
diff --git a/Documentation/networking/batman-adv.txt b/Documentation/networking/batman-adv.txt
index ff23b75..1b5e7a7 100644
--- a/Documentation/networking/batman-adv.txt
+++ b/Documentation/networking/batman-adv.txt
@@ -187,7 +187,7 @@
 
 For more information, please see the manpage (man batctl).
 
-batctl is available on http://www.open-mesh.org/
+batctl is available on https://www.open-mesh.org/
 
 
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