One of the key action scenes in the new Marvel Studios film, “Shang-Chi and the Legend of the Ten Rings,” involves a city bus losing control on California Street in San Francisco’s Nob Hill neighborhood. Other scenes are filmed in the city’s Richmond District -- not a typical locale for a major Hollywood production. The film, released Sept. 3, celebrates San Francisco and Asian Americans in other ways as well. We’ll talk about San Francisco’s role in the movie, which is already one of the year’s biggest hits.