98bae8195d
Sort unstable items last in rustdoc, instead of first As far as I can tell, this is a bug introduced inadvertently by https://github.com/rust-lang/rust/pull/77817 in Rust 1.49. Older toolchains used to sort unstable items last. Notice how in the code before that PR, `(Unstable, Stable) => return Ordering::Greater` in src/librustdoc/html/render/mod.rs. Whereas after that PR, `(Unstable, Stable) => return Ordering::Less`. Compare https://doc.rust-lang.org/1.48.0/std/marker/index.html vs https://doc.rust-lang.org/1.49.0/std/marker/index.html.