Fix link to Kudu service overview

Current doc points to an Azure Fridays video that is no longer available from Azure Videos. Proposing update to point to docs describing Kudu service. Alternatively, video resource is still available on Scott Hanselman's YouTube channel.

Author: davmhelm

articles/app-service/environment/using.md

@@ -210,7 +210,7 @@ To delete:
 [Pricing]: https://azure.microsoft.com/pricing/details/app-service/
 [ARMOverview]: ../../azure-resource-manager/management/overview.md
 [ConfigureSSL]: ../configure-ssl-certificate.md
-[Kudu]: https://azure.microsoft.com/resources/videos/super-secret-kudu-debug-console-for-azure-web-sites/
+[Kudu]: ../resources-kudu.md
 [AppDeploy]: ../deploy-local-git.md
 [ASEWAF]: ./integrate-with-application-gateway.md
 [AppGW]: ../../web-application-firewall/ag/ag-overview.md