2.x url is invalid

In this[ page](https://huaweicse.github.io/servicecomb-java-chassis-doc/java-chassis/zh_CN/)

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<body>


2.8.x | [中文](https://servicecomb.apache.org/references/java-chassis/2.x/zh_CN/), [English](https://servicecomb.apache.org/references/java-chassis/2.x/en_US/)
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</body>
</html>
url in the box is invaild