Amazon was marketing a collection of Chinese Communist Party President Xi Jinping’s speeches and writings on its Chinese website about two years ago, when Beijing delivered an edict — no reviews less than the highest five stars allowed — Reuters reports, citing “two people familiar with the incident.” Steve Stecklow and Jeffrey Dastin for Reuters : A negative review of Xi’s book prompted the demand, one of the people said. “I think the issue was anything under five stars,” the highest rating in Amazon’s five-point system, said the other person. Ratings and reviews are a crucial part of Amazon’s e-commerce…