Use () instead of [u8; 0] in opaque type
#456
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There once was a comment in the opaque structs section of the FFI chapter which explained that the empty array is used to avoid a warning around
()in FFI. Since Rust 1.72, the compiler no longer warns about using()in FFI.This PR swaps
[u8; 0]for()in the example opaque structs to avoid any future confusion.