请在文档中补充<Tooltip/>组件的api属性

[lovesL]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

我想改提示信息的内容，我在文档中未找到任何关于此组件有哪些API

What does the proposed API look like?

期望尽快补全

[tangying1027]

已补充 https://github.com/antvis/F2/pull/1619