docs(storybook): document the default slot

Author: iOvergaard

packages/uui-toast-notification-container/lib/uui-toast-notification-container.element.ts

@@ -8,6 +8,7 @@ import { property } from 'lit/decorators.js';
 
 /**
  * @element uui-toast-notification-container
+ * @slot default - slot for toast layout/content
  */
 @defineElement('uui-toast-notification-container')
 export class UUIToastNotificationContainerElement extends LitElement {

packages/uui-toast-notification/lib/uui-toast-notification.element.ts

@@ -18,7 +18,7 @@ import { UUIToastNotificationEvent } from './UUIToastNotificationEvent';
  *  @fires {UUIToastNotificationEvent} closing - fires when the toast is starting to close
  *  @fires {UUIToastNotificationEvent} closed - fires when the toast is closed
  *  @description - Component for displaying a toast notification, preferably used in toast-notification-container.
- *  @slot - for dialog layout/content
+ *  @slot default - slot for dialog layout/content
  */
 @defineElement('uui-toast-notification')
 export class UUIToastNotificationElement extends LitElement {