(Image credit: Taylor Hill via Getty Images) The ongoing legal fight between OpenAI co-founders Elon Musk and Sam Altman has seen the release of a treasure-trove of internal documentation from the firm's earliest years. One minor theme has been the presence of Gabe Newell, who gave the company over $20 million and was the sole member of its "informal advisory board" in 2018: he later personally emailed Musk to try and get Hideo Kojima a tour of SpaceX . The latest batch of documents includes an email exchange from late 2015, in which Musk, Altman, and Greg Brockman are discussing various aspects of how the company will be set up and funded. Another topic is what they're actually going to call it and, whaddya know, Valve turns up in Musk's thought process one more time.…