Update to mdbook 0.5

This updates to mdbook 0.5.2 from mdbook 0.4.52. A primary aspect of
this change is that it splits the `mdbook` crate into multiple crates,
and various API changes and cleanup.

There's full release notes and a migration guide at
https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-050.

This also includes submodule updates:

## book

8 commits in f660f341887c8bbcd6c24fbfdf5d2a262f523965..9c9104e8a82430f97f42e738051bda718919211c
2025-10-27 21:41:51 -0400 to 2025-12-10 11:33:49 -0500
- Update to mdbook 0.5
- Update ch07-02-defining-modules-to-control-scope-and-privacy.md
- use AND for search terms
- Consistently use let...else
- Merge branch 'main' into fix-typo-17-02
- Fix typo in section 17.2
- Revert "Fix typo in section 17.2"
- Fix typo in section 17.2

## edition-guide

2 commits in 5c621253d8f2a5a4adb64a6365905db67dffe3a2..c3c0f0b3da26610138b7ba7663f60cd2c68cf184
2025-10-23 14:13:01 +0000 to 2025-11-28 18:54:18 +0000
- Update to mdbook 0.5 (rust-lang/edition-guide#381)
- Link to 1.56.0 and 1.85.0 blog posts (rust-lang/edition-guide#380)

## nomicon

6 commits in 60f0b30d8ec1c9eb5c2582f2ec55f1094b0f8c42..9fe8fa599ad228dda74f240cc32b54bc5c1aa3e6
2025-10-20 13:05:39 +0000 to 2025-12-03 11:54:04 +0000
- Remove references to outdated unsafe code guidelines (rust-lang/nomicon#512)
- Update to mdbook 0.5 (rust-lang/nomicon#511)
- Fix grammar in ffi.md (rust-lang/nomicon#510)
- Add CITATION.cff (rust-lang/nomicon#507)
- Use the newest Layout::array size checks for vec-alloc (rust-lang/nomicon#508)
- review comment: dropck analysis is *not* trivial (rust-lang/nomicon#498)

## reference

17 commits in e122eefff3fef362eb7e0c08fb7ffbf5f9461905..50c5de90487b68d429a30cc9466dc8f5b410128f
2025-10-28 20:52:27 +0000 to 2025-12-09 22:19:05 +0000
- UB: update the extra clause for provenance UB during const evaluation (rust-lang/reference#2091)
- Remove `[no-mentions]` handler in our triagebot config (rust-lang/reference#2102)
- Clarify that omitting `nostack` is a promise from the compiler to the programmer (rust-lang/reference#1999)
- Specify that range patterns must be nonempty. (rust-lang/reference#2093)
- Update to mdbook 0.5 (rust-lang/reference#2096)
- get rid of const.no-mut-refs (rust-lang/reference#2080)
- use oxford comma (rust-lang/reference#2099)
- document `cfg` conditions on inline assembly templates and operands (rust-lang/reference#2063)
- remove unused "link reference definitions" (rust-lang/reference#2092)
- Add review process overview to review-policy.md (rust-lang/reference#2088)
- Remove restriction on dereferencing pointers in const (rust-lang/reference#2090)
- add 'system' to variadic ABIs (rust-lang/reference#2069)
- Guarantee the binary representation of `isize` explicitly (rust-lang/reference#2064)
- Update `no_implicit_prelude` to use the attribute template (rust-lang/reference#1914)
- Update `no_std` to use the attribute template (rust-lang/reference#1913)
- const_eval.md: be more clear where link leads to (rust-lang/reference#2083)
- specify s390x target features (rust-lang/reference#1972)

## rust-by-example

7 commits in 160e6bbca70b0c01aa4de88d19db7fc5ff8447c3..7d21279e40e8f0e91c2a22c5148dd2d745aef8b6
2025-11-03 09:26:45 -0300 to 2025-12-01 15:02:09 -0300
- Update to mdbook 0.5 (rust-lang/rust-by-example#1977)
- Use `From::from` fn pointer to convert to boxed errors (rust-lang/rust-by-example#1906)
- link the _tuple_ page instead "TupleStruct" (rust-lang/rust-by-example#1909)
- enum_use.md: avoid an uncommon term (rust-lang/rust-by-example#1976)
- make search less surprising (rust-lang/rust-by-example#1975)
- Update documentation for `any` function in iter_any.md (rust-lang/rust-by-example#1973)
- Revise `Path` type documentation for clarity (rust-lang/rust-by-example#1972)

Author: ehuss

src/doc/book

@@ -1,13 +1,9 @@
 [book]
-multilingual = false
-src = "src"
 title = "The rustc book"
 
 [output.html]
 git-repository-url = "https://github.com/rust-lang/rust/tree/HEAD/src/doc/rustc"
 edit-url-template = "https://github.com/rust-lang/rust/edit/HEAD/src/doc/rustc/{path}"
-additional-css = ["theme/pagetoc.css"]
-additional-js = ["theme/pagetoc.js"]
 
 [output.html.search]
 use-boolean-and = true

src/doc/edition-guide

@@ -4,7 +4,7 @@ Rustdoc's HTML output includes a settings menu, and this chapter describes what
 each setting in this menu does.
 
 It can be accessed by clicking on the gear button
-(<i class="fa fa-cog" aria-hidden="true"></i>) in the upper right.
+(<i class="fas fa-gear" aria-hidden="true"></i>) in the upper right.
 
 ## Changing displayed theme
 

src/doc/nomicon

@@ -1,8 +1,6 @@
 [book]
 title = "The Rust Style Guide"
-author = "The Rust Style Team"
-multilingual = false
-src = "src"
+authors = ["The Rust Style Team"]
 
 [output.html]
 git-repository-url = "https://github.com/rust-lang/rust/tree/HEAD/src/doc/style-guide/"