Fix the rustdocs

[FL03]

The crate documentation fails to build when published.

[FL03]

The culprit seems to be the rand_core crate and its usage of a depreciated attribute.

[INFO] [stderr] error[E0557]: feature has been removed
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rand_core-0.9.3/src/lib.rs:35:29
[INFO] [stderr]    |
[INFO] [stderr] 35 | #![cfg_attr(docsrs, feature(doc_auto_cfg))]
[INFO] [stderr]    |                             ^^^^^^^^^^^^ feature has been removed
[INFO] [stderr]    |
[INFO] [stderr]    = note: removed in 1.92.0; see <https://github.com/rust-lang/rust/pull/138907> for more information
[INFO] [stderr]    = note: merged into `doc_cfg`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: could not find `de` in `__private228`
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/rand_core-0.9.3/src/block.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 |     results: R::Results,
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^ could not find `de` in `__private228`
...