add rustfmt raw identifer sorting doc

src/SUMMARY.md

@@ -48,6 +48,7 @@
   - [Cargo: Table and key name consistency](rust-2024/cargo-table-key-names.md)
   - [Cargo: Reject unused inherited default-features](rust-2024/cargo-inherited-default-features.md)
   - [Rustfmt: Combine all delimited exprs as last argument](rust-2024/rustfmt-overflow-delimited-expr.md)
+  - [Rustfmt: Raw identifier sorting](rust-2024/rustfmt-raw-identifier-sorting.md)
   - [`gen` keyword](rust-2024/gen-keyword.md)
   - [Macro fragment specifiers](rust-2024/macro-fragment-specifiers.md)
   - [Missing macro fragment specifiers](rust-2024/missing-macro-fragment-specifiers.md)

src/rust-2024/rustfmt-raw-identifier-sorting.md

@@ -0,0 +1,50 @@
+# Rustfmt: Raw identifier sorting
+
+🚧 The 2024 Edition has not yet been released and hence this section is still "under construction".
+
+More information may be found in the tracking issue at <https://github.com/rust-lang/rust/issues/124764>.
+
+## Summary
+
+`rustfmt` now properly sorts [raw identifiers].
+
+[raw identifiers]: ../../reference/identifiers.html#raw-identifiers
+
+## Details
+
+The [Rust Style Guide] includes [rules for sorting][sorting] that `rustfmt` applies in various contexts, such as on imports.
+
+Prior to the 2024 Edition, when sorting rustfmt would use the leading `r#` token instead of the ident which led to unwanted results. For example:
+
+```rust
+use websocket::client::ClientBuilder;
+use websocket::r#async::futures::Stream;
+use websocket::result::WebSocketError;
+```
+
+In the 2024 Edition, `rustfmt` now produces:
+
+```rust
+use websocket::r#async::futures::Stream;
+use websocket::client::ClientBuilder;
+use websocket::result::WebSocketError;
+```
+
+[Rust Style Guide]: ../../style-guide/index.html
+[sorting]: ../../style-guide/index.html#sorting
+
+## Migration
+
+The change can be applied automatically by running `cargo fmt` or `rustfmt` with the 2024 Edition.
+
+With a `Cargo.toml` file that has `edition` set to `2024`, run:
+
+```sh
+cargo fmt
+```
+
+Or run `rustfmt` directly:
+
+```sh
+rustfmt foo.rs --style-edition 2024
+```