container/heap: add available godoc link

Change-Id: I886a8869ba885286ac8219bc7e245c9237ad4c99
Reviewed-on: https://go-review.googlesource.com/c/go/+/534777
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: shuang cui <imcusg@gmail.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>

src/container/heap/heap.go

@@ -21,13 +21,13 @@ import "sort"
 // for a type using the routines in this package.
 // Any type that implements it may be used as a
 // min-heap with the following invariants (established after
-// Init has been called or if the data is empty or sorted):
+// [Init] has been called or if the data is empty or sorted):
 //
 //	!h.Less(j, i) for 0 <= i < h.Len() and 2*i+1 <= j <= 2*i+2 and j < h.Len()
 //
-// Note that Push and Pop in this interface are for package heap's
+// Note that [Push] and [Pop] in this interface are for package heap's
 // implementation to call. To add and remove things from the heap,
-// use heap.Push and heap.Pop.
+// use [heap.Push] and [heap.Pop].
 type Interface interface {
 	sort.Interface
 	Push(x any) // add x as element Len()
@@ -55,7 +55,7 @@ func Push(h Interface, x any) {
 
 // Pop removes and returns the minimum element (according to Less) from the heap.
 // The complexity is O(log n) where n = h.Len().
-// Pop is equivalent to Remove(h, 0).
+// Pop is equivalent to [Remove](h, 0).
 func Pop(h Interface) any {
 	n := h.Len() - 1
 	h.Swap(0, n)
@@ -78,7 +78,7 @@ func Remove(h Interface, i int) any {
 
 // Fix re-establishes the heap ordering after the element at index i has changed its value.
 // Changing the value of the element at index i and then calling Fix is equivalent to,
-// but less expensive than, calling Remove(h, i) followed by a Push of the new value.
+// but less expensive than, calling [Remove](h, i) followed by a Push of the new value.
 // The complexity is O(log n) where n = h.Len().
 func Fix(h Interface, i int) {
 	if !down(h, i, h.Len()) {