Merge pull request #24257 from ydcool/zh-cleanup-training-content

Clean up zh training content

Author: k8s-ci-robot

content/zh/docs/tutorials/_index.md

@@ -45,12 +45,6 @@ Before walking through each tutorial, you may want to bookmark the
 * [Kubernetes Basics](/docs/tutorials/kubernetes-basics/) is an in-depth interactive tutorial that helps you understand the Kubernetes system and try out some basic Kubernetes features.
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-* [使用 Kubernetes (Udacity) 的可伸缩微服务](https://www.udacity.com/course/scalable-microservices-with-kubernetes--ud615)
-
-<!--
-* [Scalable Microservices with Kubernetes (Udacity)](https://www.udacity.com/course/scalable-microservices-with-kubernetes--ud615)
--->
-
 * [介绍 Kubernetes (edx)](https://www.edx.org/course/introduction-kubernetes-linuxfoundationx-lfs158x#)
 
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