Rollup merge of rust-lang#110149 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

1 commits in 0510ca84c2ce6bf93c4ccf9248756e9e4fd00b12..c06006157b14b3d47b5c716fc392b77f3b2e21ce
2023-04-03 15:31:55 UTC to 2023-04-03 15:31:55 UTC

- Fix grammar (rust-lang/book#3600)

## rust-lang/reference

3 commits in 3c47807a3131b3c7cacb508f52632078d253cd0a..1f8dc727e94ae4ef92adf70df979521a1ea1143e
2023-04-09 14:04:53 UTC to 2023-03-29 13:21:47 UTC

- Explain typos in `asm!` can be unsound (rust-lang/reference#1344)
- Fix coding style in example: add space between module name and bracket (rust-lang/reference#1347)
- redundant word removed (rust-lang/reference#1346)

## rust-lang/rust-by-example

1 commits in ba84bf35d0f17d404003349309201654d25f61af..31961fe22521a779070a44a8f30a2b00a20b6212
2023-04-10 13:06:34 UTC to 2023-04-10 13:06:34 UTC

- Add clarity to name of file being used in library example. (rust-lang/rust-by-example#1697)

## rust-lang/rustc-dev-guide

8 commits in fca8af6..6337ed1
2023-04-10 14:23:05 UTC to 2023-04-06 00:29:18 UTC

- fix markup (rust-lang/rustc-dev-guide#1670)
- Reorganize "Getting Started" and add a "What should I work on?" section (rust-lang/rustc-dev-guide#1665)
- Clarify cfg(bootstrap) docs (rust-lang/rustc-dev-guide#1669)
- Link to forge instead of duplicating toolstate info (rust-lang/rustc-dev-guide#1664)
- Improve the landing page for contributing to the libstd docs (rust-lang/rustc-dev-guide#1666)
- Various improvements to `check_line_lengths.sh` (rust-lang/rustc-dev-guide#1667)
- Document how to ignore specific files in a diff (rust-lang/rustc-dev-guide#1668)
- mention `git clone --depth 1` (rust-lang/rustc-dev-guide#1663)