pkg: change function comments to fix the linux-amd64-fmt build failure

pkg/traceutil/trace.go

@@ -55,7 +55,7 @@ func New(op string, fields ...Field) *Trace {
 	return &Trace{operation: op, startTime: time.Now(), fields: fields}
 }
 
-// traceutil.TODO() returns a non-nil, empty Trace
+// traceutil.TODO returns a non-nil, empty Trace
 func TODO() *Trace {
 	return &Trace{}
 }