man: Fix link_mode priority description

... to match knet source code.

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

man/corosync.conf.5

@@ -254,7 +254,7 @@ link_mode
 This specifies the Kronosnet mode, which may be passive, active, or
 rr (round-robin).
 .B passive:
-the active link with the lowest priority will be used. If one or more
+the active link with the highest priority will be used. If one or more
 links share the same priority the one with the lowest link ID will
 be used.
 .B active: