Quick Chicken Pot Pie

Name: Quick Chicken Pot Pie
Ingredients: 1 package refrigerator biscuits; Table salt; 4 tablespoons unsalted butter; 1 medium onion , minced; 1 rib celery , chopped fine; 1/4 cup all-purpose flour; 1/8 teaspoon cayenne pepper; 2 3/4 cups low-sodium chicken broth; 1/2 cup heavy cream; 2 teaspoons chopped fresh thyme leaves; 1 (10-ounce) package frozen peas and carrots; 1 rotisserie chicken , skin discarded, meat shredded into large bite-sized pieces (4 cups); 4 teaspoons lemon juice; Ground black pepper