Auto merge of #156111 - JonathanBrouwer:rollup-8X18OBD, r=JonathanBrouwer

Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#156073 ([rustdoc] Fix `doc_cfg` feature on reexports)
 - rust-lang/rust#152216 (Fix 'assign to data in an index of' collection suggestions)
 - rust-lang/rust#155433 (Rip out rustc_layout_scalar_valid_range_* attribute support)
 - rust-lang/rust#156098 (Hand-implement `impl Debug for NumBuffer` to avoid constraining `T` or printing MaybeUninit)

Author: bors

src/unsafety-checking.md

@@ -30,14 +30,8 @@ side of an assignment expression and allows union fields to directly appear
 there, while erroring in all other cases. Union field accesses can also occur
 in patterns, so those have to be walked as well.
 
-The other complicated safety check is for writes to fields of layout constrained
-structs (such as [`NonNull`]). These are found by looking for the borrow or
-assignment expression and then visiting the subexpression being borrowed or
-assigned with a separate visitor.
-
 [THIR]: ./thir.md
 [`check_unsafety`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_build/check_unsafety/index.html
-[`NonNull`]: https://doc.rust-lang.org/std/ptr/struct.NonNull.html
 
 ## The unused_unsafe lint