sphinx is not rendering enum members

This worked originally; at some point it changed.

https://github.com/sphinx-doc/sphinx/issues/1609

I tried just slotting this into our auto-generated tree, but it looks like this will only work once we re-structure the docs to be better organized and less reliant on "just auto-generate everything and dump it in a big pile".

首先检查链接的 Sphinx issue #1609 和仓库的自动生成文档树。确定 enum 成员应显示在哪里，以及当前的文档结构是否能够支持此更改；完成的标准是 enum 成员能够正确渲染，而不依赖无结构的生成 dump。

由索引模型根据 Issue 内容生成。