fix typo in queue_manager.go comment
@@ -529,7 +529,7 @@ func (s *shards) start(n int) {
// stop the shards; subsequent call to enqueue will return false.
func (s *shards) stop() {
// Attempt a clean shutdown, but only wait flushDeadline for all the shards
- // to cleanly exit. As we're doing RPCs, enqueue can block indefinately.
+ // to cleanly exit. As we're doing RPCs, enqueue can block indefinitely.
// We must be able so call stop concurrently, hence we can only take the
// RLock here.
s.mtx.RLock()
