Rollup merge of rust-lang#153619 - rustbot:docs-update, r=ehuss

Update books

## rust-embedded/book

4 commits in 99d0341ff4e06757490af8fceee790c4ede50bc0..e88aa4403b4bf2071c8df9509160477e40179099
2026-02-28 20:13:44 UTC to 2026-02-28 20:07:25 UTC

- Clarify that a mini usb cable is used on the STM32F3DISCOVERY (rust-embedded/book#381)
- Update outdated qemu documentation (rust-embedded/book#403)
- Add TRACE32 to Debuggers section (rust-embedded/book#406)
- Add a link to Rust for Zephyr (rust-embedded/book#407)

## rust-lang/nomicon

4 commits in b8f254a991b8b7e8f704527f0d4f343a4697dfa9..cc6a6bae8c3bfa389974e533c54694662c1a9de6
2026-02-27 23:27:18 UTC to 2026-02-26 22:57:03 UTC

- Fix `Vec::push_all` ptr code in exception-safety (rust-lang/nomicon#418)
- Clarify parameter and argument compatibility (rust-lang/nomicon#516)
- Improve grammar in Variance section (rust-lang/nomicon#515)
- Explicit `extern "C"` ABI for FFI (rust-lang/nomicon#520)

## rust-lang/reference

7 commits in 50a1075e879be75aeec436252c84eef0fad489f4..c49e89cc8c7c2c43ca625a8d5b7ad9a53a9ce978
2026-03-04 15:39:00 UTC to 2026-03-01 06:34:18 UTC

- Resolve grammar rules in link reference definitions (rust-lang/reference#2198)
- Support non-ASCII Unicode in grammar rule names (rust-lang/reference#2196)
- Fix grammar for block comments (rust-lang/reference#2191)
- Fix an EN grammar error & add an item to place expr context list (rust-lang/reference#2189)
- Align attribute template with applied conventions (rust-lang/reference#2194)
- Update shebang (rust-lang/reference#2192)
- Remove RESERVED_NUMBER (rust-lang/reference#2193)

Author: JonathanBrouwer