M / CLOUDY LONDON (Amazon. com Inc. was marketing a collection of President Xi Jinping’s speeches and writings on its Chinese website about two years ago, when Beijing issued an edict, according to two other people familiar with the incident. you will have to avoid allowing visitor ratings and reviews in China. A negative review of Xi’s e-book sparked demand, one of the other people said. “I think the challenge has less than five stars,” the highest score of Amazon’s five-point system, the other user said. Ratings and reviews are a component of Amazon’s e-commerce business, a primary way to…