package/leafnode2: Add user 'news', add note about inetd to help text

Suggested by Thomas:
http://lists.busybox.net/pipermail/buildroot/2014-October/107727.html



[Thomas: minor formatting improvements]

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>