By Carolyn Brown For the Valley Advocate Decades ago, Will Matthews was a kid at Amherst Regional High School who listened to Frank Sinatra, played the trombone and loved making his classmates laugh. Now, he’s celebrating the release of his new Netflix show. Alongside co-creator Jeffrey Addiss, the Amherst native serves as the co-showrunner for science-fiction series, “The Boroughs,” which premiered its eight-episode debut season on Netflix on T…