Nuggets are on notice, sandwiches be warned, and move over tacos: a donut is now heating up the battle for spicy superiority.In addition to its usual Halloween offerings, Dunkin’ is debuting a new Spicy Ghost Pepper Donut at participating locations starting on Oct. 14, billing it as the first “pepper-packed donut” to be served nationwide.Dunkin’ said it is a “deliciously daring donut that delivers the