By Akash Sriram (Reuters) -Uber missed operating profit expectations on Tuesday and issued a downbeat earnings forecast for the key holiday quarter, overshadowing strong demand for its rides and food deliveries driven by growing adoption of its membership program. The company blamed the weak profit on undisclosed legal and regulatory matters. Its shares fell about 8%, following a more than 60% rise in the stock so far this year. Investors have watched Uber's profitability closely as it transitioned from ...