doc: fix the readme link (#365)

Author: libukai

docs/cn/README.md

@@ -10,7 +10,7 @@
 [![Huggingface](https://img.shields.io/badge/🤗%20-Models-yellow.svg?style=for-the-badge)](https://huggingface.co/2Noise/ChatTTS)
 [![Open In Colab](https://img.shields.io/badge/Colab-F9AB00?style=for-the-badge&logo=googlecolab&color=525252)](https://colab.research.google.com/github/2noise/ChatTTS/blob/main/examples/ipynb/colab.ipynb)
 
-[**English**](README.md) | **简体中文** | [**日本語**](docs/jp/README.md) | [**Русский**](docs/ru/README.md)
+[**English**](../../README.md) | **简体中文** | [**日本語**](../jp/README.md) | [**Русский**](../ru/README.md)
 
 </div>