(Corrects spelling of Taiwan in headline) By Caroline Valetkevitch NEW YORK (Reuters) -The yen was up slightly against the dollar Tuesday, adding to recent gains as increasing tensions over U.S. House of Representatives Speaker Nancy Pelosi’s planned visit to Taiwan made investors more risk averse. China’s offshore yuan fell against the dollar, touching its lowest level since mid-May. “You’re seeing intensifying tensions between the world’s two largest economies, and that is starting to weigh on risk appetite,” said Edward Moya, senior market analyst at Oanda. “There’s significant Japanese yen…