example conf: Remove Duplicate "debug" statement

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Fabio M. Di Nitto <fdinitto@redhat.com>

conf/corosync.conf.example.udpu

@@ -18,7 +18,6 @@ logging {
 	fileline: off
 	to_logfile: yes
 	to_syslog: yes
-	debug: on
 	logfile: /var/log/cluster/corosync.log
 	debug: off
 	timestamp: on