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Rollup merge of rust-lang#93888 - sunfishcode:sunfishcode/impl-asfd-f…
…or-ref, r=joshtriplett Implement `AsFd` for `&T` and `&mut T`. Add implementations of `AsFd` for `&T` and `&mut T`, so that users can write code like this: ```rust pub fn fchown<F: AsFd>(fd: F, uid: Option<u32>, gid: Option<u32>) -> io::Result<()> { ``` with `fd: F` rather than `fd: &F`. And similar for `AsHandle` and `AsSocket` on Windows. Also, adjust the `fchown` example to pass the file by reference. The code can work either way now, but passing by reference is more likely to be what users will want to do. This is an alternative to rust-lang#93869, and is a simpler way to achieve the same goals: users don't need to pass borrowed-`BorrowedFd` arguments, and it prevents a pitfall in the case where users write `fd: F` instead of `fd: &F`. r? ``@joshtriplett``
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