refactor(topology/instances/discrete): refactor the proof of `discrete_topology.order_topology_of_pred_succ` to show an equivalence (#16831)
refactor(topology/instances/discrete): refactor the proof of `discrete_topology.order_topology_of_pred_succ` to show an equivalence (#16831)






leanprover-community/mathlib,leanprover-community/mathlib