Documentation needs to mention that enums in "extern C++" need to be `uint8_t`

[johnperry-math]

Today I kept hitting the error where my enum's were the wrong size. This was fixed by changing the C++ side from

enum class Something { First, Second };

to

enum class Something : uint8_t { First, Second };

As far as I can tell, the documentation does not mention this. Perhaps it should?

[hombit]

Another option is #[repr(u32)] at the Rust side.