Update code comments of `c_void` to explain the reasoning for its current implementation

We need at least two variants of the enum as otherwise the compiler
complains about the #[repr(u8)] attribute and we also need at least one
variant as otherwise the enum would be uninhabitated and dereferencing
pointers to it would be UB.

As such, mark the variants not unstable because they should not actually
exist but because they are temporary implementation details until
`extern type` is stable and can be used instead.

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