docs: Some docs updated to reflect the latest formatting changes

docs/users_guide/framework_basics/the_affine_space.md

@@ -491,7 +491,7 @@ room_temp room_ref{};
 room_temp room_low = room_ref - number_of_steps * step_delta;
 room_temp room_high = room_ref + number_of_steps * step_delta;
 
-std::println("Room reference temperature: {} ({}, {:{%N:.2f}%?%U})\n",
+std::println("Room reference temperature: {} ({}, {::N[.2f]})\n",
              room_ref.quantity_from_zero(),
              room_ref.in(usc::degree_Fahrenheit).quantity_from_zero(),
              room_ref.in(si::kelvin).quantity_from_zero());