Fix spelling (#3181)

Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>

src/renderer/components/notifications/notifications.store.tsx

@@ -39,7 +39,7 @@ export interface Notification {
   message: NotificationMessage;
   status?: NotificationStatus;
   timeout?: number; // auto-hiding timeout in milliseconds, 0 = no hide
-  onClose?(): void; // additonal logic on when the notification times out or is closed by the "x"
+  onClose?(): void; // additional logic on when the notification times out or is closed by the "x"
 }
 
 export class NotificationsStore {