Auto merge of rust-lang#146685 - jdonszelmann:rollup-kwuih4z, r=jdonszelmann

Rollup of 7 pull requests

Successful merges:

 - rust-lang#146458 (Add parallel-frontend-threads to bootstrap.toml and enable multi-threaded parallel compilation)
 - rust-lang#146485 (Remove unsized arg handling in `ArgAbiBuilderMethods::store_fn_arg` implementations)
 - rust-lang#146536 (clean up several trait related UI tests)
 - rust-lang#146598 (Make llvm_enzyme a regular cargo feature)
 - rust-lang#146647 (Move `#[rustc_coherence_is_core]` to the `crate_level` file)
 - rust-lang#146654 (Do not use `git -C dir`)
 - rust-lang#146681 (Add space after brace in `Box<[T]>::new_uninit_slice` example)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

alloc/src/boxed.rs

@@ -640,7 +640,7 @@ impl<T> Box<[T]> {
     /// values[0].write(1);
     /// values[1].write(2);
     /// values[2].write(3);
-    /// let values = unsafe {values.assume_init() };
+    /// let values = unsafe { values.assume_init() };
     ///
     /// assert_eq!(*values, [1, 2, 3])
     /// ```