Fix some typos in comment (#1750)

Signed-off-by: zhoulin xie <zhoulin.xie@daocloud.io>

dispatch/dispatch.go

@@ -144,7 +144,7 @@ func (d *Dispatcher) Stop() {
 	<-d.done
 }
 
-// notifyFunc is a function that performs notifcation for the alert
+// notifyFunc is a function that performs notification for the alert
 // with the given fingerprint. It aborts on context cancelation.
 // Returns false iff notifying failed.
 type notifyFunc func(context.Context, ...*types.Alert) bool

notify/notify.go

@@ -294,7 +294,7 @@ func (rs RoutingStage) Exec(ctx context.Context, l log.Logger, alerts ...*types.
 	return s.Exec(ctx, l, alerts...)
 }
 
-// A MultiStage executes a series of stages sequencially.
+// A MultiStage executes a series of stages sequentially.
 type MultiStage []Stage
 
 // Exec implements the Stage interface.