Update rewarded-video.md

docs/api/a-d/rewarded-video.md

 **激励视频广告**
 
-此文档已过时，新文档: [https://uniapp.dcloud.net.cn/component/ad-rewarded-video.html](https://uniapp.dcloud.net.cn/component/ad-rewarded-video.html)
+# 此文档已过期，新文档: [https://uniapp.dcloud.net.cn/component/ad-rewarded-video.html](https://uniapp.dcloud.net.cn/component/ad-rewarded-video.html)
 
+===========以下为过期文档=========
 
 [激励视频广告介绍](https://uniapp.dcloud.net.cn/component/ad-rewarded-video.html)