Fix spelling errors in manual corosync.conf 5

• dont to don't
• overriden to overridden
• informations to information

Change-Id: If6644694d750c30ba9f5f43b4eb852485613d64a
Signed-off-by: Richard B Winters <rik@mmogp.com>
Reviewed-by: Steven Dake <sdake@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>