Unrolled build for rust-lang#135444

Rollup merge of rust-lang#135444 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

10 commits in 04d06dfe541607e6419f3d028c3f9b245f3be4d9..5a65e2af063ff701ae858f1f7536ee347b3cfe63
2025-01-09 17:59:43 UTC to 2025-01-06 13:47:07 UTC

- Appendix E: Update for 2024 Edition (rust-lang/book#4196)
- Implement and integrate an mdBook plugin to strip markup from headings (rust-lang/book#4195)
- Update appendix-06-translation.md - new persian translation added (rust-lang/book#4192)
- Remove extraneous `use` statement (rust-lang/book#4193)
- Take measurement inaccuracy intervals into account (rust-lang/book#4078)
- Ch. 21.3: remove error ferris from working code (rust-lang/book#4183)
- infra: match mdbook version in CI to rust-lang/rust (rust-lang/book#4191)
- Ch. 17: Set correct heading level for the chapter (rust-lang/book#4190)
- Switch back from `eprintln!` to `println!` in listing 17-12 (rust-lang/book#4178)
- fix typo in Listing invocation for listing 20-14 (rust-lang/book#4184)

## rust-lang/nomicon

1 commits in 7ef05b9777c94836bc92f50f23e6e00981521a89..625b200e5b33a5af35589db0bc454203a3d46d20
2025-01-06 17:17:38 UTC to 2025-01-06 17:17:38 UTC

- Fix accidental inline HTML in Markdown (rust-lang/nomicon#474)

## rust-lang/reference

3 commits in acd6794e712d5e2ef6f5c84fb95688d32a69b816..293af991003772bdccf2d6b980182d84dd055942
2025-01-07 16:31:22 UTC to 2025-01-06 17:17:15 UTC

- Add spec identifiers to dynamically-sized-types.md (rust-lang/reference#1582)
- fix typo in a "rule" name in type-coercions.md (rust-lang/reference#1708)
- Fix unclosed `<sup>` elements (rust-lang/reference#1709)

## rust-lang/rust-by-example

2 commits in 093397535b48ae13ec76bc526b7e6eb8c096a85c..054259ed1bf01cdee4309ee764c7e103f6df3de5
2025-01-13 10:44:04 UTC to 2025-01-03 18:59:26 UTC

- Fix function name in new_types.md in Japanese (rust-lang/rust-by-example#1907)
- Fix typo in static_lifetime.md (rust-lang/rust-by-example#1905)

src/bootstrap/src/core/build_steps/tool.rs

@@ -334,7 +334,11 @@ macro_rules! bootstrap_tool {
 }
 
 bootstrap_tool!(
-    Rustbook, "src/tools/rustbook", "rustbook", submodules = SUBMODULES_FOR_RUSTBOOK;
+    // This is marked as an external tool because it includes dependencies
+    // from submodules. Trying to keep the lints in sync between all the repos
+    // is a bit of a pain. Unfortunately it means the rustbook source itself
+    // doesn't deny warnings, but it is a relatively small piece of code.
+    Rustbook, "src/tools/rustbook", "rustbook", is_external_tool = true, submodules = SUBMODULES_FOR_RUSTBOOK;
     UnstableBookGen, "src/tools/unstable-book-gen", "unstable-book-gen";
     Tidy, "src/tools/tidy", "tidy";
     Linkchecker, "src/tools/linkchecker", "linkchecker";