Is this a general concept that needs to be documented or a specific API?
Currently, https://dev-rust.binary.ninja hosts the rust api docs, but not the binaryninjacore-sys docs. Tagging the -sys crate with the correct html_root_url tag and uploading it under the same domain would yield major benefits to rust users. For one, it would allow to see the auto generated bindings without building them locally, and second, it would automatically link type aliases of the wrapper crate to the original source. That way enum values and the likes can be inspected without, again, building the docs for the -sys crate locally.

Are there any known examples of people using this API/concept?
All that needs to be done is to add the binaryninjacore-sys crate to the list of crates to be built for docs and uploaded to the same html root folder that is also used to serve the binaryninja crate docs. The 2 crates do not need to have their docs built at the same time for this to work.