I saw some posts in a forum about how homemade shaders can replace Spine's shaders. I noticed that the responses all mentioned the (Spine-unity Runtime Documentation: Writing your own shaders), but when I clicked on the link, I found it unresponsive. Has the relevant content been moved somewhere else?
Custom shader
Init Sorry for the confusion! I think the headings are different in the Chinese language spine-unity runtime documentation, so it doesn't jump properly. Here is a link to the section in the Chinese documentation:
https://zh.esotericsoftware.com/spine-unity#%E7%BC%96%E5%86%99%E8%87%AA%E5%B7%B1%E7%9A%84%E7%9D%80%E8%89%B2%E5%99%A8
(Since the screenshot you attached has a statement saying "this is written in English" in Chinese, I assumed that you might be looking at the Chinese page. Sorry if I am wrong).