[Heap] Update docs

Author: lorentey

Documentation/Heap.md

@@ -104,17 +104,7 @@ We also have non-optional flavors that assume the heap isn't empty, `removeMin()
 
 ### Iteration
 
-`Heap` itself doesn't conform to `Sequence` because of the potential confusion around which direction it should iterate (largest-to-smallest? smallest-to-largest?). Instead, we expose two iterators that conform to `Sequence`:
-
-```swift
-for val in heap.ascending {
-    ...
-}
-
-for val in heap.descending {
-    ...
-}
-```
+`Heap` itself doesn't conform to `Sequence` because of the potential confusion around which direction it should iterate (largest-to-smallest? smallest-to-largest?).
 
 ### Performance