BULK Fix broken links

This PR contains fixes to broken links. For work item request details see [558724](https://dev.azure.com/msft-skilling/Content/_workitems/edit/558724)

Author: v-thepet

articles/cdn/cdn-china-delivery.md

@@ -41,16 +41,16 @@ Azure Content Delivery Network global and Azure Content Delivery Network China h
 
      - Two pricing tiers: Standard and premium
 
-     - [Documentation](https://docs.azure.cn/en-us/cdn/)
+     - [Documentation](https://docs.azure.cn/en-us/frontdoor/china-cdn-retirement-faq)
 
 ## Next steps
 
 To learn more about Azure Content Delivery Network China, see:
 
 - [Content Delivery Network features](https://www.azure.cn/en-us/home/features/cdn/)
 
-- [Overview of Azure Content Delivery Network](https://docs.azure.cn/en-us/cdn/cdn-overview)
+- [Overview of Azure Content Delivery Network](https://docs.azure.cn/en-us/frontdoor/azure-china-cdn-and-afd-comparison)
 
-- [Use the Azure content delivery network](https://docs.azure.cn/en-us/cdn/cdn-how-to-use)
+- [Use the Azure content delivery network](https://docs.azure.cn/en-us/frontdoor/azure-china-cdn-migration-to-azure-front-door-guidance)
 
 - [Azure service availability in China](/azure/china/concepts-service-availability)