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Improve the function pointer docs This is #97842 but for function pointers instead of tuples. The concept is basically the same. * Reduce duplicate impls; show `fn (T₁, T₂, …, Tₙ)` and include a sentence saying that there exists up to twelve of them. * Show `Copy` and `Clone`. * Show auto traits like `Send` and `Sync`, and blanket impls like `Any`. https://notriddle.com/notriddle-rustdoc-test/std/primitive.fn.html
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.