Cook linguine according to package directions; drain. Meanwhile, in a small bowl, mix cornstarch, broth and wine until smooth. In a nonstick skillet, heat butter over medium heat. Add garlic; cook and stir 1 minute. Add mushrooms, green onions and carrot; stir-fry 2-3 minutes or until vegetables are crisp-tender., Stir cornstarch mixture and add to pan. Bring to a boil; cook and stir 1-2 minutes or until sauce is thickened. Reduce heat. Add scallops and parsley; cook until scallops are firm and opaque. Serve with linguine and, if desired, lemon wedges.