update readme and doc

app/README.md

 # Gradio Demo
 
-Please refer our Gradio Demo doc:
+Please refer our gradio deployment doc:
 
-[English doc](https://lightx2v-en.readthedocs.io/en/latest/deploy_guides/deploy_gradio.html)
-[中文文档](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/deploy_guides/deploy_gradio.mdl)
+[English doc: Gradio Deployment](https://lightx2v-en.readthedocs.io/en/latest/deploy_guides/deploy_gradio.html)
+
+[中文文档: Gradio 部署](https://lightx2v-zhcn.readthedocs.io/zh-cn/latest/deploy_guides/deploy_gradio.html)

docs/EN/source/deploy_guides/deploy_gradio.md

-# Lightx2v Gradio Demo Interface
+# Gradio Deployment
 
 ## 📖 Overview
 

docs/ZH_CN/source/deploy_guides/deploy_gradio.md

-# Lightx2v Gradio 演示界面
+# Gradio 部署
 
 ## 📖 概述