This is a generalization of PR 92940: that PR handled cases like `impl Foreign for Box<Local>`, but was missing handling for a few other closely related cases.
My particular interest was with showing `impl From<Box<Utf8Path>> for Box<Path>` in camino's documentation. But I ended up handling a bunch of related cases along the way.
I'm new to rustdoc so please let me know if I got anything wrong :) took a bit to fully understand how this worked.
Rain