Brazilian President Jair Bolsonaro, who is running for a second term, attends a press conference after a presidential debate in Rio de Janeiro, Brazil, Oct. 29, 2022.Bruna Prado/The Associated Press Pivotal elections in Brazil and the United States will present an early test to Twitter’s new owner Elon Musk and his promise to ease up on the platform’s policies on misinformation. Voters in both nations have already faced a torrent of misleading claims about candidates, issues and voting. That torrent could become a deluge if Musk makes good on his vows to roll back Twitter’s rules just as millions of...