Add a `documentation` remapping path scope for rustdoc usage This PR adds a new remapping path scope for rustdoc usage: `documentation`, instead of rustdoc abusing the other scopes for it's usage. Like remapping paths in rustdoc, this scope is unstable. (rustdoc doesn't even have yet an equivalent to [rustc `--remap-path-scope`](https://doc.rust-lang.org/nightly/rustc/remap-source-paths.html#--remap-path-scope)). I also took the opportunity to add a bit of documentation in rustdoc book. |
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