“John Lithgow: Stories By Heart” is actor John Lithgow’s love letter to storytelling in which he performs two short stories by Ring Lardner and P.G. Wodehouse and shares a few of his own.  Mr. Lithgow is charming as ever, and gives an impressive performance, but the show itself is disappointing and long-winded.  I wanted more Lithgow, and less Lardner and Wodehouse.