Fixed link jump 404 error in documentation：The error part of the Chinese document is modified.

[LinQi0777]

Update _index.cn.md ：Chinese document link redirection error modified，corresponding to the Chinese part of issue #31126 error.

Fixes #31126.

Changes proposed in this pull request:

• Fix link jump 404 error in document，After modification, the jump result is shown as follows:

The results of the test were all right.

Before committing this PR, I'm sure that I have checked the following options:

• [x] My code follows the code of conduct of this project.
• [x] I have self-reviewed the commit code.
• [x] I have (or in comment I request) added corresponding labels for the pull request.
• [ ] I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• [x] I have made corresponding changes to the documentation.
• [x] I have added corresponding unit tests for my changes.