Rollup merge of #140719 - wyfo:patch-1, r=lcnr

fix typo in autorefs lint doc example

The documentation is talking about other way using only raw pointers, but the example was use `std::slice::from_raw_parts_mut` which also create a reference. `std::ptr::slice_from_raw_parts_mut` should be used instead, and it also highlights the benefit of raw pointer manipulation compared to dereference, as the function doesn't need to be unsafe anymore.

Moreover, [`unsafe_op_in_unsafe_fn`](https://doc.rust-lang.org/edition-guide/rust-2024/unsafe-op-in-unsafe-fn.html) warning has been enabled since Edition 2024, so I've updated the examples to use unsafe blocks.

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