CompaniesBEIJING, Nov 18 (Reuters) - China's Xiaomi (1810.HK), opens new tab reported a 80.9% jump in third-quarter profit on Tuesday as the world's third-largest smartphone maker doubled down on its shift into electric vehicles.Adjusted net profit reached 11.3 billion yuan ($1.59 billion), exceeding the average estimate of 10.3 billion yuan, according to LSEG data.The Reuters Daily Briefing newsletter provides all the news you need to start your day. Sign up here.The company said in a stock fi...