Update ISSUE_TEMPLATE

Fix typo

.github/ISSUE_TEMPLATE

@@ -15,24 +15,24 @@ Please skip to the English section below if you don't write Chinese.
 
 5)  请附上你的配置（提交 Issue 前请隐藏服务器端IP地址）。
 
-    服务器端配置:
+服务器端配置:
 ```javascript
     // 在这里附上服务器端配置文件
 ```
 
-    客户端配置:
+客户端配置:
 ```javascript
     // 在这里附上客户端配置
 ```
 
 6)  请附上出错时软件输出的错误日志。在 Linux 中，日志通常在 `/var/log/v2ray/error.log` 文件中。
 
-    服务器端错误日志:
+服务器端错误日志:
 ```
     // 在这里附上服务器端日志
 ```
 
-    客户端错误日志:
+客户端错误日志:
 ```
     // 在这里附上客户端日志
 ```
@@ -72,23 +72,24 @@ If you are not sure if your question is truely a bug in V2Ray, please discuss it
 
 5) Please attach your configuration file (**Mask IP addresses before submit this issue**).
 
-    Server configuration:
+Server configuration:
 ```javascript
     // Please attach your server configuration here.
 ```
 
-    Client configuration:
+Client configuration:
 ```javascript
     // Please attach your client configuration here.
 ```
 
 6) Please attach error logs, especially the bottom lines if the file is large. Error log file is usually at `/var/log/v2ray/error.log` on Linux.
 
-    Server error log:
+Server error log:
 ```
     // Please attach your server error log here.
 ```
-    Client error log:
+
+Client error log:
 ```
     // Please attach your client error log here.
 ```