By Tony Munroe and Muyu Xu BEIJING (Reuters) -Beijing doused its Olympic flame on Sunday night, closing a Games that will be remembered for the extremes of its anti-COVID-19 measures and outrage over the doping scandal that enveloped 15-year-old Russian skating sensation Kamila Valieva. Chinese President Xi Jinping was on hand for the snowflake-themed ceremony at the Bird’s Nest stadium, where International Olympic Committee President Thomas Bach described the Beijing Games as “truly exceptional” before declaring them closed. The Beijing Games, contained inside a “closed loop”, were the second…