Make it more obvious how to add text

Is your feature request related to a problem? Please describe.

I've just started using Folium, and while it is very useful, I have been frustrated by the lack of documentation on how to add text elements - other than marker tooltips and popups, neither of which are initially visible to the user. As far as I can see there is nothing at all in the user guide or advanced guide.

A search for 'text' doesn't seem to point to anything relevant either, except PolyLineTextPath which is for a relatively specialist text case.

From StackOverflow etc. searches, the simplest solution for most cases seems to be to use a DivIcon for most cases. But that is very hidden in the documentation. I can see there are other methods via Leaflet or branca APIs.

Describe the solution you'd like

• Add a Text section to the user guide with recommended ways to add text elements.
• Add a bit of detail including the word 'text' to relevant API sections so they can be found more easily.

Describe alternatives you've considered
n/a

Additional context
n/a

Implementation
folium is maintained by volunteers. Can you help make a PR if we want to implement this feature?
Probably, depending on how complex it is to make docs changes.

首先阅读 issue 中链接的用户指南、高级指南和 DivIcon API 参考，以找到相关的文档章节。用户指南包含一个「Text」章节，介绍添加可见文本的推荐方式，并且相关 API 章节包含使文本相关示例可搜索的措辞，即表示完成。