Rollup merge of rust-lang#147236 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

1 commits in 33f1af40cc44dde7e3e892f7a508e6f427d2cbc6..1d7c3e6abec2d5a9bfac798b29b7855b95025426
2025-09-28 21:24:16 UTC to 2025-09-28 21:24:16 UTC

- Chunk of chapters from copyedit (rust-lang/book#4506)

## rust-lang/edition-guide

1 commits in aa6ce337c0adf7a63e33960d184270f2a45ab9ef..e2ed891f00361efc26616d82590b1c85d7a8920e
2025-10-01 17:11:54 UTC to 2025-10-01 17:11:54 UTC

- link to never type fallback lint as deny by default (rust-lang/edition-guide#377)

## rust-lang/nomicon

1 commits in f17a018b9989430967d1c58e9a12c51169abc744..23fc2682f8fcb887f77d0eaabba708809f834c11
2025-09-24 10:10:31 UTC to 2025-09-24 10:10:31 UTC

- a typo in ffi.md (rust-lang/nomicon#502)

## rust-lang/reference

13 commits in cc7247d8dfaef4c39000bb12c55c32ba5b5ba976..e11adf6016a362766eea5a3f9832e193994dd0c8
2025-09-29 00:55:42 UTC to 2025-09-23 23:33:32 UTC

- const functions: separate rule about users and rule about what is allowed in such functions (rust-lang/reference#2013)
- use "tuple enum variant" more consistently (rust-lang/reference#2015)
- Remove caveats related to `format_args!` expansion (rust-lang/reference#2017)
- RISC-V: Extension Updates (including document references) (rust-lang/reference#2002)
- Move inferred sentence to an example block (rust-lang/reference#2019)
- Add triagebot range-diff feature (rust-lang/reference#2011)
- use AND when searching for multiple terms (rust-lang/reference#2016)
- enumerations.md: fix pluralisation (rust-lang/reference#2014)
- const_eval.md: use sentence case for section title, for consistency (rust-lang/reference#2012)
- destructors.md: improve readability by adding pauses (rust-lang/reference#2007)
- RISC-V: Add vector state registers (rust-lang/reference#2005)
- destructors.md: point to core:: instead of std:: (rust-lang/reference#2006)
- Create Whitespace grammar productions (rust-lang/reference#1991)

Author: matthiaskrgr