LOS ANGELES (Reuters) – Pop superstar Beyonce is stepping behind the camera to direct a behind-the-scenes documentary about her personal and professional life, U.S. cable channel HBO said on Monday. The currently untitled film will debut on February 16 and show the Grammy-winning singer's life in the recording studio, readying for live performances and running her own TV and music production company. "Everybody knows Beyonce's music, but few know Beyonce the person," HBO Programming President Michael Lombardo said in a statement. …