Update Basic.lean

Author: CoolRmal

Mathlib/Order/BoundedOrder/Basic.lean

@@ -263,6 +263,8 @@ class BoundedOrder (α : Type u) [LE α] extends OrderTop α, OrderBot α
 attribute [to_dual self (reorder := 3 4)] BoundedOrder.mk
 attribute [to_dual existing] BoundedOrder.toOrderTop
 
+instance {α : Type*} [LE α] [OrderTop α] [OrderBot α] : BoundedOrder α where
+
 instance OrderDual.instBoundedOrder (α : Type u) [LE α] [BoundedOrder α] : BoundedOrder αᵒᵈ where
   __ := inferInstanceAs (OrderTop αᵒᵈ)
   __ := inferInstanceAs (OrderBot αᵒᵈ)