rustdoc: display rustc_private APIs as "Internal" This PR updates the display of `rustc_private` APIs to be "Internal" instead of "Experimental", and changes the colors appropriately. It also updates the copy of the `rustc_private` feature to sound more informative and less like a compiler suggestion. The PR additionally contains a significant refactor of the `short_stability` function to remove duplication and fix a few rendering bugs due to extra or missing spaces. Before:  After:  |
||
|---|---|---|
| .. | ||
| clean | ||
| html | ||
| passes | ||
| Cargo.toml | ||
| config.rs | ||
| core.rs | ||
| doctree.rs | ||
| externalfiles.rs | ||
| fold.rs | ||
| lib.rs | ||
| markdown.rs | ||
| README.md | ||
| test.rs | ||
| theme.rs | ||
| visit_ast.rs | ||
| visit_lib.rs | ||
For more information about how librustdoc works, see the rustc guide.