Rollup merge of rust-lang#145856 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/nomicon

1 commits in 3ff384320598bbe8d8cfe5cb8f18f78a3a3e6b15..57ed4473660565d9357fcae176b358d7e8724ebf
2025-08-18 17:31:07 UTC to 2025-08-18 17:31:07 UTC

- Fix unknown field `author` error when building the book (rust-lang/nomicon#500)

## rust-lang/reference

11 commits in 59b8af811886313577615c2cf0e045f01faed88b..89f67b3c1b904cbcd9ed55e443d6fc67c8ca2769
2025-08-22 07:16:52 UTC to 2025-08-14 18:42:19 UTC

- Update `instruction_set` to use the attribute template (rust-lang/reference#1912)
- Update `debugger_visualizer` to use the attribute template (rust-lang/reference#1922)
- Update `collapse_debuginfo` to use the attribute template (rust-lang/reference#1923)
- Clarify operand evaluation order in compound assignment with primitiv… (rust-lang/reference#1941)
- Switch to using native mdbook fragment redirects (rust-lang/reference#1965)
- Fix traits implemented for function items (rust-lang/reference#1969)
- Clarify that safe extern items do not require unsafe (rust-lang/reference#1970)
- Update `type_length_limit` to use the attribute template (rust-lang/reference#1917)
- Add missing rule identifier for const outer generics (rust-lang/reference#1962)
- Fix indentation of static path restriction text (rust-lang/reference#1961)
- Add doc for `sse4a` and `tbm` (rust-lang/reference#1949)

## rust-lang/rust-by-example

2 commits in adc1f3b9012ad3255eea2054ca30596a953d053d..ad27f82c18464525c761a4a8db2e01785da59e1f
2025-08-20 23:50:16 UTC to 2025-08-13 21:41:46 UTC

- Support building books using mdbook in main (v0.5.x) (rust-lang/rust-by-example#1952)
- Improve the hints in `fmt` (1.2.3. Formatting); mention type casting (rust-lang/rust-by-example#1951)

Author: jhpratt