Fix typo in comment

blockstore/timed.go

@@ -49,7 +49,7 @@ func (t *TimedCacheBlockstore) Start(_ context.Context) error {
 	t.closeCh = make(chan struct{})
 
 	// Create this timer before starting the goroutine. Otherwise, creating the timer will race
-	// with addint time to the mock clock, and we could add time _first_, then stall waiting for
+	// with adding time to the mock clock, and we could add time _first_, then stall waiting for
 	// a timer that'll never fire.
 	ticker := t.clock.Ticker(t.interval)
 	go func() {