Ms. Lea Salonga officially returns to Broadway this fall in one of her favorite shows, “Once on This Island.” The Tony Award winner made it official by posting a tweet after “keeping this for months.” Ms. Salonga stars alongside Alex Newell (Glee), Merle Dandridge (Greenleaf), and Quentin Earl Darrington (Cats). The show is a revival of Lynn Ahrens’ and Stephen Flaherty’s musical. …