selinux: Corrected comment to match kernel-doc comment

Minor documentation update.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/avc.c

@@ -819,7 +819,7 @@ int __init avc_add_callback(int (*callback)(u32 event), u32 events)
 }
 
 /**
- * avc_update_node Update an AVC entry
+ * avc_update_node - Update an AVC entry
  * @event : Updating event
  * @perms : Permission mask bits
  * @ssid,@tsid,@tclass : identifier of an AVC entry