Review feedback.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

storage/remote/client_test.go

@@ -74,7 +74,7 @@ func TestStoreHTTPErrorHandling(t *testing.T) {
 			t.Fatal(err)
 		}
 
-		err = c.Store(context.TODO(), &prompb.WriteRequest{})
+		err = c.Store(context.Background(), &prompb.WriteRequest{})
 		if !reflect.DeepEqual(err, test.err) {
 			t.Errorf("%d. Unexpected error; want %v, got %v", i, test.err, err)
 		}

storage/remote/queue_manager.go

@@ -420,7 +420,7 @@ func (s *shards) stop(deadline time.Duration) {
 		level.Error(s.qm.logger).Log("msg", "Failed to flush all samples on shutdown")
 	}
 
-	// Force a unclean shutdown.
+	// Force an unclean shutdown.
 	s.cancel()
 	<-s.done
 	return