Some of Wall Street’s best-known billionaire investors are reshuffling their bets on Chinese technology stocks amid the artificial-intelligence boom, with Stanley Druckenmiller returning to the market for the first time in more than two years with a stake in Baidu. Druckenmiller, an investor known for his decades-long track record of outsized returns, bought 88,200 of Baidu’s American depositary receipts (ADRs) – US-traded securities that represent shares in the Chinese company – through his...