(Reuters) - China's Alibaba Group Holding Ltd reported a better-than-expected 40% rise in second-quarter revenue on Friday, powered by strong growth in its e-commerce and cloud computing businesses.The company's U.S.-listed shares rose more than 2% to $180.25 in trading before the bell.Alibaba primarily earns by selling advertising and promotional services to third-party merchants that list products on Taobao and Tmall, two of its e-commerce sites.The biggest Chinese e-commerce company and..