go/token: tweak comment

(accidentally omitted from CL 675736)

Change-Id: I05ed8fcb7bb4109862a47701c427d8efc17b9f31
Reviewed-on: https://go-review.googlesource.com/c/go/+/678315
TryBot-Bypass: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>

diff --git a/src/go/token/tree.go b/src/go/token/tree.go
index 5c00dcf2dffc4897648272530f100ec97fa101ae..eaa2b30ee5c2f0aa63f65588e5c0b6e5223d3112 100644 (file)
--- a/src/go/token/tree.go
+++ b/src/go/token/tree.go
@@ -390,8 +390,9 @@ func (t *tree) deleteSwap(pos **node) {
        t.rebalanceUp(unbalanced)
 }
 
-// deleteMin updates *zpos to the minimum (leftmost) element
-// in that subtree.
+// deleteMin updates the subtree rooted at *zpos to delete its minimum
+// (leftmost) element, which may be *zpos itself. It returns the
+// deleted node.
 func (t *tree) deleteMin(zpos **node) (z *node) {
        for (*zpos).left != nil {
                zpos = &(*zpos).left