By Summer Zhen HONG KONG, May 12 (Reuters) – Global hedge funds ramped up bets on Asia, with weekly buying of South Korean, Japanese and Taiwanese stocks hitting a 10-year high last week, according to a Morgan Stanley client note. Most of the equities buying “took place outside the U.S. with APAC driving the majority of the activity,” said a Morgan Stanley prime brokerage team note that was sent to clients on Friday. It was seen by Reuters on …