Elon Musk has stepped up his court fight with OpenAI by demanding documents from ex-board member Helen Toner, who was a key player in the short-lived ousting of OpenAI Chief Executive Officer Sam Altman last year.Musk, one of OpenAI’s earliest investors, asked Toner to hand over documents and communications related to her departure from the OpenAI board and the decision to remove and reinstate Altman as CEO of the artificial intelligence giant, according to a filing in DC Superior Court....