Add mozilla telemetry to recommended blocked domains

doc/EN/mobile.org

 127.0.0.1       www.google-analytics.com
 127.0.0.1       google-analytics.com
 127.0.0.1       ssl.google-analytics.com
+127.0.0.1       telemetry.mozilla.org
+127.0.0.1       incoming.telemetry.mozilla.org
 #+end_src
 
 Then upload the hosts file back again with: