The official trailer for director R.J. Cutler's new documentary, Belushi, leads with a killer sentiment from the subject of the documentary: "I'd rather be an anarchist than a professional." The anarchist-wannabe in question is the late John Belushi, whose life and legacy will be the subject of Cutler's documentary, coming to Showtime in November. Belushi's imprint on the comedy world is deep despite his relatively brief run in the spotlight before his untimely death at age 33 in 1982. With just 13 movie and TV credits to his name, including Saturday Night Live, Animal …