【TUILiveKit】【iOS】modify readme

Author: lleihai123

iOS/README-zh_CN.md

@@ -25,14 +25,14 @@ _[English](README.md) | 简体中文_
 #### 1. 下载代码
 
 ```
-$ git clone https://github.com/Tencent-RTC/TUILiveKit.git
+git clone https://github.com/Tencent-RTC/TUILiveKit.git
 ```
 
 #### 2. 加载依赖库
 
 ```
-$ cd TUILiveKit/iOS/Example
-$ pod install
+cd TUILiveKit/iOS/Example
+pod install
 ```
 
 #### 3. 配置 SDKAppID 和 SDKSecretKey

iOS/README.md

@@ -29,14 +29,14 @@ If you would like to try the sample app specifically fit to your usage, you can
 #### 1. Clone this repository
 
 ```
-$ git clone https://github.com/Tencent-RTC/TUILiveKit.git
+git clone https://github.com/Tencent-RTC/TUILiveKit.git
 ```
 
 #### 2. Install dependencies
 
 ```
-$ cd TUILiveKit/iOS/Example
-$ pod install
+cd TUILiveKit/iOS/Example
+pod install
 ```
 
 #### 3. Specify the SDKAppID and SDKSecretKey