Rollup merge of #146898 - rustbot:docs-update, r=ehuss

Update books

## rust-lang/book

1 commits in 3e9dc46aa563ca0c53ec826c41b05f10c5915925..33f1af40cc44dde7e3e892f7a508e6f427d2cbc6
2025-09-15 16:10:14 UTC to 2025-09-15 16:10:14 UTC

- Release trpl 0.3 (rust-lang/book#4505)

## rust-lang/reference

9 commits in b3ce60628c6f55ab8ff3dba9f3d20203df1c0dee..cc7247d8dfaef4c39000bb12c55c32ba5b5ba976
2025-09-20 10:26:26 UTC to 2025-09-08 18:07:29 UTC

- Document temporary scoping for destructuring assignments (rust-lang/reference#1992)
- Specify lifetime extension of `pin!` and `format_args!` arguments (rust-lang/reference#1980)
- update for more ABIs supporting c-variadics (rust-lang/reference#1936)
- Fix incorrect span tag (rust-lang/reference#1995)
- Remove strike attribute (rust-lang/reference#1997)
- Specify the target limits for target-specific ABIs (rust-lang/reference#2000)
- Remove tuple index carve out (rust-lang/reference#1966)
- Enable folding of chapter listing in navigation sidebar (rust-lang/reference#1988)
- Add support to grammar for single line comments (rust-lang/reference#1993)

## rust-lang/rust-by-example

1 commits in dd26bc8e726dc2e73534c8972d4dccd1bed7495f..2c9b490d70e535cf166bf17feba59e594579843f
2025-09-18 22:28:52 UTC to 2025-09-18 22:28:52 UTC

- Update unit testing output for additional test (rust-lang/rust-by-example#1958)