[task] optimized configuration item description document

## Why you need it?
Is your feature request related to a problem? Please describe in details

Configuration items documentation: https://seata.io/zh-cn/docs/user/configurations.html
配置项说明文档：https://seata.io/zh-cn/docs/user/configurations.html

The current document is poorly structured and needs to be reorganized.
目前的文档的结构比较差，需要重新组织内容结构。

In addition, the missing configuration items need to be supplemented. If you are unsure of the meaning of specific configuration items consult the community Committer to help you.

另外，需要对新配置项的缺失需要做补充。如果你对具体配置项的含义不理解可以咨询社区的committer来帮助你。

You can find the missing configuration item by comparing it with `https://github.com/seata/seata/tree/develop/script/client/spring , https://github.com/seata/seata/blob/develop/server/src/main/resources/application.example.yml`.

可以通过和 `https://github.com/seata/seata/tree/develop/script/client/spring 、https://github.com/seata/seata/blob/develop/server/src/main/resources/application.example.yml ` 对比发现缺失配置项。

## How it could be?
A clear and concise description of what you want to happen. You can explain more about input of the feature, and output of it.

## Other related information
Add any other context or screenshots about the feature request here.