man: Fix consensus timeout

The consensus timeout is 1.2 * token_timeout,
which has been changeg from 1000 to 3000, so change also consensus
timeout.

Signed-off-by: miharahiro <hmihara@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

man/corosync.conf.5

@@ -471,7 +471,7 @@ than token.  There is an increasing risk of odd membership changes, which still
 guarantee virtual synchrony,  as node count grows if consensus is less than
 token.
 
-The default is 1200 milliseconds.
+The default is 3600 milliseconds.
 
 .TP
 merge