git-scm.com's api-builtin still exists after removal from Git

[derrickstolee]

URL for broken page

https://git-scm.com/docs/api-builtin

Problem

This commit removed the api-builtin docs from Git in 2017, but the page still exists. This information is now very false due to some recent refactors in the builtin API.

Operating system and browser

macOS and Safari, though that doesn't matter.

Steps to reproduce

The page should be a 404, but it is not.

[derrickstolee]

If you are adverse to making potential external links to the page becoming broken, then perhaps a pointer to the docs in builtin.h would be preferable to incorrect information.

[jnavila]

Our script do not manage files that have vanished at the moment. The thing is that we want to present documents that existed in older versions.