Where do I file a bug about std vs. core docs?

The project I work on is #![no_std], so I frequently use the core crate. However, almost every link to the documentation for an item in core points to the docs for std, which makes it difficult to discover types in core.

I'm hoping to file a bug to get some improvement there, but I have no idea what repository to file the bug against. What is the appropriate place to file a bug for this?

I'm not sure if that would be fixed in the standard library or in rustdoc, but either way it would be an issue for rust-lang/rust.