docs: Change little doc bugs

1. Remove statement about missing English doc
2. Change file name in doc brief

Change-Id: Id29602fdeb7400345622d955ab851af0a8139632

README-zh_CN.rst

@@ -1,7 +1,7 @@
 使用说明
 ========
 
-简体中文 \| `English <./README.md>`__
+简体中文 \| `English <./README.rst>`__
 
 **目录**
 

README.rst

@@ -1,7 +1,7 @@
 Instructions
 ============
 
-`简体中文 <./README-zh_CN.md>`__\ \| English
+`简体中文 <./README.zh_CN.rst>`__\ \| English
 
 **Table of contents**
 

docs/en/develop/2-catalog-introduction.md

@@ -5,11 +5,11 @@ English | [Chinese](../../zh/develop/2-catalog-introduction.md)
 - `Gruntfile.js`：Used to collect i18n
 - `LICENSE`: This project uses Apache License
 - `Makefile`:
-- `README.md`: A brief description of the front-end startup, please refer to the docs for details
+- `README.rst`: A brief description of the front-end startup, please refer to the docs for details
 - `config`: webpack configuration, which contains webpack configuration in public, development environment, test environment, and build environment
 - `cypress.json`: E2E test configuration file
 - `docker`: Contains the docker configuration used in the development environment, generation environment, and test environment
-- `docs`: Documentation introduction, including Chinese, English, development documentation, testing documentation, the en documentation is temporarily missing
+- `docs`: Documentation introduction, including Chinese, English, development documentation, testing documentation
 - `jest.config.js`: Unit test configuration file
 - `jsconfig.json`: javascript code configuration file
 - `package.json`: Configuration files such as installation packages and commands
@@ -99,7 +99,7 @@ English | [Chinese](../../zh/develop/2-catalog-introduction.md)
 ├── Gruntfile.js (Used to collect i18n)
 ├── LICENSE
 ├── Makefile
-├── README.md
+├── README.rst
 ├── config
 │   ├── theme.js
 │   ├── webpack.common.js

docs/zh/develop/2-catalog-introduction.md

@@ -5,11 +5,11 @@
 - `Gruntfile.js`：用于收集 i18n
 - `LICENSE`: 该项目使用 Apache License
 - `Makefile`:
-- `README.md`: 前端启动的简单说明，详细信息请参考 docs 文档
+- `README-zh_CN.rst`: 前端启动的简单中文说明，详细信息请参考 docs 文档
 - `config`目录: webpack 配置，其内包含公用、开发环境、测试环境、生成环境下的 webpack 配置
 - `cypress.json`: e2e 测试的配置文件
 - `docker`: 内含开发环境、生成环境、测试环境使用的 docker 配置
-- `docs`目录: 文档介绍，包含中文、英文、开发说明文档、测试说明文档，其中 en 文档暂缺失
+- `docs`目录: 文档介绍，包含中文、英文、开发说明文档、测试说明文档
 - `jest.config.js`: 单元测试的配置文件
 - `jsconfig.json`: js 代码的配置文件
 - `package.json`: 安装包、命令等配置文件
@@ -99,7 +99,7 @@
 ├── Gruntfile.js (用于收集i18n)
 ├── LICENSE
 ├── Makefile
-├── README.md
+├── README.rst
 ├── config
 │   ├── theme.js
 │   ├── webpack.common.js