A scone is a nice little baked item. The British often have them with their tea in the afternoon. In America they are usually called biscuits (a term that has a quite different meaning in BrE) and are most often eaten at breakfast time with gravy.
But your passage is about pronunciation. I believe that in AmE the usual pronunciation rhymes with on or gone, while in BrE it tends to rhyme with tone and bone. I stand ready to be corrected on this.