If each man page has different random numbers (perhaps seeded on the man page section and name), then I could see that it might be a memory aid, kinda like havi

If each man page has different random numbers (perhaps seeded on the man page section and name), then I could see that it might be a memory aid, kinda like having different floors of a building painted different colours, while different layers have different carpeting and different organisations inside the building have different artistic styles: one's subconscious learns what one's environment indicates, and it makes navigation much easier.