Rollup merge of #154901 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/reference

6 commits in 7446bf9697c95d155eef33c6a9d91fbd29a5e359..d2715c07e9dd9839c0c7675ecfa18bec539a6ee9
2026-03-31 18:18:16 UTC to 2026-03-23 21:49:16 UTC

- Guarantee size and alignment of more integer primitives (rust-lang/reference#2205)
- [type layout] usize and isize have the same size and alignment (rust-lang/reference#2200)
- Update reference for attribute order changes (rust-lang/reference#2213)
- Fix note for non_exhaustive enum read (rust-lang/reference#2211)
- Update link_name duplicates note (rust-lang/reference#2216)
- Note scoping differences between `*x` and `*x.deref()` , and `a[b]` and `*a.index(b)` (rust-lang/reference#2073)

## rust-lang/rust-by-example

8 commits in 5383db524711c0c9c43c3ca9e5e706089672ed6a..b31e3b8da01eeba0460f86a52a55af82709fadf5
2026-04-01 11:59:18 UTC to 2026-03-30 12:17:12 UTC

- fix: correct into_iter() example to compile properly (rust-lang/rust-by-example#2001)
- fix: correct destruction order comments in Drop TempFile example (rust-lang/rust-by-example#2002)
- fix: replace confusing 'module' with 'item' in formatted print docs (rust-lang/rust-by-example#2003)
- fix: clarify misleading 'Error' comment in print_display example (rust-lang/rust-by-example#2004)
- fix: clarify comment about tuple struct field access in testcase_list (rust-lang/rust-by-example#2005)
- fix: correct iter/into_iter type comments in iter_find example (rust-lang/rust-by-example#2006)
- fix: replace year-to-days conversion with miles-to-km in newtype example (rust-lang/rust-by-example#2007)
- Add a pub use example (rust-lang/rust-by-example#2000)

Author: jhpratt