Improve corosync-notifyd example

Example now contains default option -d, so corosync-notifyd init script
don't fall. Also description is improved a little bit.

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

tools/corosync-notifyd.sysconfig.example

@@ -1,9 +1,10 @@
 #
-# See "man corosync-notifyd" for descriptions of
+# See "man corosync-notifyd" for detailed descriptions of
 # the options below.
 #
 # OPTIONS="-d -s -l -m <snmp manager address>"
 #
 
-OPTIONS=""
+# Send DBUS signals on all events (for SNMP traps, use -s)
+OPTIONS="-d"