[Website]: 关于官方文档中Quick starts中Combine dynamic and explicit mappings存在误导性说明的问题

### Before you submit

- [x] This issue is about a documentation page, flow, or piece of content.

### Type of issue

Inaccurate

### What documentation page or section is affected

https://www.elastic.co/guide/en/elasticsearch/reference/8.19/getting-started.html#getting-started-explicit-mapping

### What happened?

在这个页面中，有一部分为：Combine dynamic and explicit mappings，这里简单介绍了dynamic 的用法以及效果，
其中 When an index has the dynamic flag set to true, you can add new fields to documents without updating the mapping.这句话存在歧义，
为True时，应该是动态映射，文档添加新字段时，映射会动态更新。而不是"you can add new fields to documents without updating the mapping.
"

### Additional info

_No response_