tasklog/{log,waiting_task}.go: fix code comments

We can update several code comments in the "tasklog" package to
reflect their corresponding functions and fix typos.

tasklog/log.go

@@ -115,7 +115,7 @@ func (l *Logger) Close() {
 	l.wg.Wait()
 }
 
-// Waitier creates and enqueues a new *WaitingTask.
+// Waiter creates and enqueues a new *WaitingTask.
 func (l *Logger) Waiter(msg string) *WaitingTask {
 	t := NewWaitingTask(msg)
 	l.Enqueue(t)
@@ -139,7 +139,7 @@ func (l *Logger) List(msg string) *ListTask {
 	return t
 }
 
-// List creates and enqueues a new *SimpleTask.
+// Simple creates and enqueues a new *SimpleTask.
 func (l *Logger) Simple() *SimpleTask {
 	t := NewSimpleTask()
 	l.Enqueue(t)

tasklog/waiting_task.go

@@ -28,8 +28,8 @@ func (w *WaitingTask) Complete() {
 	close(w.ch)
 }
 
-// Done implements Task.Done and returns a channel which is closed when
-// Complete() is called.
+// Updates implements the Task.Updates function and returns a channel of updates
+// to log to the sink.
 func (w *WaitingTask) Updates() <-chan *Update {
 	return w.ch
 }