Rollup merge of #87925 - ehuss:update-books, r=ehuss

Update books

## nomicon

2 commits in f51734eb5566c826b471977747ea3d7d6915bbe9..0c7e5bd1428e7838252bb57b7f0fbfda4ec82f02
2021-07-23 18:24:35 +0900 to 2021-08-04 10:18:22 -0700
- Document lifetime elision for fn types, Fn*, impl (rust-lang/nomicon#298)
- Remove unnecessary `extern crate`s (rust-lang/nomicon#297)

## reference

3 commits in 3b7be075af5d6e402a18efff672a8a265b4596fd..4884fe45c14f8b22121760fb117181bb4da8dfe0
2021-07-26 13:20:11 -0700 to 2021-07-28 21:31:28 -0700
- Mention "function item type to `fn pointer`" coercion (rust-lang/reference#1079)
- example for bindings after at (rust-lang/reference#1027)
- array-expr.md: fix typo; 'polish' sentence (rust-lang/reference#1080)

## book

10 commits in a07036f864b37896b31eb996cd7aedb489f69a1f..7e49659102f0977d9142190e1ba23345c0f00eb1
2021-07-26 20:19:46 -0400 to 2021-08-03 21:41:35 -0400
- Make explicit that enum variant construction is a function
- Clarify why None means we have to annotate the type
- Make the convert quotes script able to do one chapter
- Snapshot of chapter 5
-  (rust-lang/book#2811)
-  (rust-lang/book#2809)
- Ugh quote script, that's not right
- Introduce the dbg macro. Connects to rust-lang/book#1658
- Add an example of declaring and instantiating unit-like structs. Fixes rust-lang/book#2442.
- Remove authors field from all the manifests (rust-lang/book#2805)

## rustc-dev-guide

5 commits in 09343d6f921d2a07c66f8c41ec3d65bf1fa52556..c4644b427cbdaafc7a87be0ccdf5d8aaa07ac35f
2021-07-26 00:37:28 +0200 to 2021-08-10 20:41:44 +0900
- Remove a dead link in `new-target.md` + other nits (rust-lang/rustc-dev-guide#1186)
- Add description of -opt-bisect-limit LLVM option (rust-lang/rustc-dev-guide#1182)
- Fixed team responsible for stabilization (rust-lang/rustc-dev-guide#1181)
- Add S-Inactive PRs as another source of things contributors could work on (rust-lang/rustc-dev-guide#1177)
- git.md: Fix No-Merge Policy link

## embedded-book

1 commits in 09986cd352404eb4659db44613b27cac9aa652fc..4f9fcaa30d11ba52b641e6fd5206536d65838af9
2021-07-18 19:26:46 +0000 to 2021-08-06 17:43:12 +0000
- Fix typo in 'Memory Mapped Registers'  (rust-embedded/book#298)