rustdoc picks an odd "canonical" path for some often-reexported types

It seems that recently, rustdoc started to not show duplicate results for a type when it gets reexported. That is great! However, the name it decides to pick is sometimes odd.

Consider for instance InterpError: rustdoc shows this as miri::InterpError, which makes it look like a type defined in Miri. That's not the case though, the type is defined in rustc_middle. I would have expected this to be shown as rustc_middle::mir::interpret::InterpError -- that's the canonical path for this type, as far as I am concerned. Certainly it should be showing some rustc crate as otherwise one could easily think that this type is not available outside Miri.

Cc @rust-lang/rustdoc