[K2] KMP: Expect/actual enums have expect modifiers but don't have actual for builtin functions

[atyrin]

Declare an expect enum and actual counterparts

// commonMain
expect enum class EventType {
    ADDED, CHANGED, REMOVED
}

// platforms
actual enum class EventType {
    ADDED, CHANGED, REMOVED
}

In generated documentation. expect parts have the modifiers for valueOf/values functions but actual don't. It doesn't affects user-defined functions.

K1 both functions are without expect-actual modifiers:

[IgnatBeresnev]

expect should be removed