Fan or not, you already know the basic beats of Victoria Beckham’s story: her working-class beginnings (let’s not get into that Rolls-Royce snafu), her Spicy “Wannabe” era, the smile-free years of being tailed by paparazzi, her foray into fashion. All the while, as she’d evolved from “the little Gucci dress, the little Gucci dress, or...