As I read Elliot Page’s eloquent and enthralling memoir, “Pageboy,” I thought about a scene from Season 2 of the Netflix superhero dramedy “The Umbrella Academy.” Page’s character, Viktor Hargreeves, who at this point in the show hasn’t yet come out as a transgender man, sits in a car with Sissy Cooper (Marin Ireland), who’s in a straight marriage that is smothering her. The two are swaddled in darkness. “Some of us don’t get to have the life we want,” Sissy laments. “That doesn’t mean we don’t want it.”