Rollup merge of #113548 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

1 commits in 21cf840842bdf768a798869f06373c96c1cc5122..668c64760b5c7ea654facb4ba5fe9faddfda27cc
2023-06-29 13:50:36 UTC to 2023-06-29 13:50:36 UTC

- Remove adjective about what kind of number this is

## rust-lang/edition-guide

2 commits in f63e578b92ff43e8cc38fcaa257b660f45c8a8c2..2751bdcef125468ea2ee006c11992cd1405aebe5
2023-07-10 14:29:51 UTC to 2023-07-08 18:05:44 UTC

- Update a link to a section in the cargo workspaces. (rust-lang/edition-guide#283)
- b'...' byte strings -> byte chars (rust-lang/edition-guide#282)

## rust-embedded/book

2 commits in f2aed2fe8e9f55508c86ba3aa4b6789b18a08a22..1e5556dd1b864109985d5871616ae6b9164bcead
2023-06-29 07:34:47 UTC to 2023-06-27 23:43:06 UTC

- add constgebra to list of math crates (rust-embedded/book#358)
- Switch to GHMQ (rust-embedded/book#357)

## rust-lang/nomicon

1 commits in c369e4b489332f8721fbae630354fa83385d457d..302b995bcb24b70fd883980fd174738c3a10b705
2023-07-05 16:08:32 UTC to 2023-07-05 16:08:32 UTC

- Minor improvements (rust-lang/nomicon#414)

## rust-lang/reference

5 commits in 5ca365eac678cb0d41a20b3204546d6ed70c7171..1ea0178266b3f3f613b0fabdaf16a83961c99cdb
2023-07-08 22:11:07 UTC to 2023-06-26 16:51:55 UTC

- Remove doc of unstable feature of never type (rust-lang/reference#1376)
- Typo: 'assingee' to 'assignee' in expressions.md (rust-lang/reference#1377)
- str type: make sentence more readable (rust-lang/reference#1374)
- Remove obsolete note about soundness hole in type-layout.md (rust-lang/reference#1367)
- Typo: 'a' to 'an' in destructors.md (rust-lang/reference#1371)

## rust-lang/rust-by-example

1 commits in 57636d6926762861f34e030d52ca25a71e95e5bf..8a87926a985ce32ca1fad1be4008ee161a0b91eb
2023-07-07 22:44:06 UTC to 2023-07-07 22:44:06 UTC

- Hint for RGB color calculation (rust-lang/rust-by-example#1726)

## rust-lang/rustc-dev-guide

18 commits in 17fe3e948498c50e208047a750f17d6a8d89669b..b5a12d95e32ae53791cc6ab44417774667ed2ac6
2023-07-09 14:50:50 UTC to 2023-06-28 04:55:24 UTC

- fix: update link to function coverage (rust-lang/rustc-dev-guide#1727)
- Fix a bug in getting-started.md (rust-lang/rustc-dev-guide#1726)
- improve explanation of placing tests in separate file (rust-lang/rustc-dev-guide#1721)
- various fixes/improvements to Contributing chapter (rust-lang/rustc-dev-guide#1723)
- ty::ConstKind has moved (rust-lang/rustc-dev-guide#1724)
- document `./x test --rustc-args` option (rust-lang/rustc-dev-guide#1719)
- tests/run-make files have moved (rust-lang/rustc-dev-guide#1716)
- replace dead link (rust-lang/rustc-dev-guide#1717)
- fix link (rust-lang/rustc-dev-guide#1718)
- update link (rust-lang/rustc-dev-guide#1709)
- typo (rust-lang/rustc-dev-guide#1706)
- OwningRef exists no more (rust-lang/rustc-dev-guide#1715)
- Try to avoid confusion (rust-lang/rustc-dev-guide#1713)
- Issue1707 doc simply use x (rust-lang/rustc-dev-guide#1710)
- include rustc-dev-guide's own issues in suggested search (rust-lang/rustc-dev-guide#1708)
- Improve feature gate and x.py docs (rust-lang/rustc-dev-guide#1701)
- Fix some links (rust-lang/rustc-dev-guide#1705)
- Define more lint terms. (rust-lang/rustc-dev-guide#1681)

src/doc/book

@@ -1 +1 @@
-Subproject commit 21cf840842bdf768a798869f06373c96c1cc5122
+Subproject commit 668c64760b5c7ea654facb4ba5fe9faddfda27cc

src/doc/edition-guide

@@ -1 +1 @@
-Subproject commit f63e578b92ff43e8cc38fcaa257b660f45c8a8c2
+Subproject commit 2751bdcef125468ea2ee006c11992cd1405aebe5

src/doc/embedded-book

@@ -1 +1 @@
-Subproject commit f2aed2fe8e9f55508c86ba3aa4b6789b18a08a22
+Subproject commit 1e5556dd1b864109985d5871616ae6b9164bcead

src/doc/nomicon

@@ -1 +1 @@
-Subproject commit c369e4b489332f8721fbae630354fa83385d457d
+Subproject commit 302b995bcb24b70fd883980fd174738c3a10b705

src/doc/reference

@@ -1 +1 @@
-Subproject commit 5ca365eac678cb0d41a20b3204546d6ed70c7171
+Subproject commit 1ea0178266b3f3f613b0fabdaf16a83961c99cdb

src/doc/rust-by-example

@@ -1 +1 @@
-Subproject commit 57636d6926762861f34e030d52ca25a71e95e5bf
+Subproject commit 8a87926a985ce32ca1fad1be4008ee161a0b91eb

src/doc/rustc-dev-guide

@@ -1 +1 @@
-Subproject commit 17fe3e948498c50e208047a750f17d6a8d89669b
+Subproject commit b5a12d95e32ae53791cc6ab44417774667ed2ac6