[QUESTION] 关于fastjson1兼容版使用文档的优化建议

### 请描述您的问题
*询问有关本项目的使用和其他方面的相关问题。*

https://github.com/alibaba/fastjson2/wiki/fastjson_1_upgrade_cn
这里应该增加fastjson1没有的新特性的描述,底层使用的fastjson2,很多用户并不清楚fastjson2增加的新特性,因此用起来会不一致.

比如

com.alibaba.fastjson.JSON.toJSONString(bigObject) 可能会被拦截 报Maximum array size exceeded. Try enabling LargeObject feature instead. Requested size: 67108885, max size: 67108864, 是fastjson2的新特性拦截大对象. fastjson1没有这个拦截

且通过fastjson1定义的接口和特性无法兼容

必须直接使用

com.alibaba.fastjson2.JSON.toJSONString(bigObject, com.alibaba.fastjson2.JSONWriter.Feature.LargeObject)

Open the linked fastjson_1_upgrade_cn wiki page and review its compatibility guidance alongside the described LargeObject example. Add a clear description of fastjson2-only behavior and the required fastjson2 API usage, then verify that the page explains how this differs from fastjson1.

Written by the indexing model from the issue text.