cmd/gofmt: fix a typo in a comment

Change-Id: I34b2b9f9b70e39c872d5edbbda4de0fe330211f5
GitHub-Last-Rev: 723e36e
GitHub-Pull-Request: #57566
Reviewed-on: https://go-review.googlesource.com/c/go/+/460457
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

src/cmd/gofmt/rewrite.go

@@ -199,7 +199,7 @@ func match(m map[string]reflect.Value, pattern, val reflect.Value) bool {
 		// object pointers and token positions always match
 		return true
 	case callExprType:
-		// For calls, the Ellipsis fields (token.Position) must
+		// For calls, the Ellipsis fields (token.Pos) must
 		// match since that is how f(x) and f(x...) are different.
 		// Check them here but fall through for the remaining fields.
 		p := pattern.Interface().(*ast.CallExpr)