Rustdoc: src links are broken

[nrc]

E.g., the src link at the top right of https://doc.rust-lang.org/nightly/std/cmp/enum.Ordering.html links to https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html?gotosrc=33347 which redirects to https://doc.rust-lang.org/nightly/core/cmp/undefined

I haven't found any links which aren't broken, but tbh I haven't tried that hard.

[bluss]

This was #37684 and it is hopefully fixed now (closed 11 hours ago).