[heycam/webidl] Why is a constant type nullable? (#446)

https://heycam.github.io/webidl/#prod-ConstType

```
ConstType ::
    PrimitiveType Null
    identifier Null
```

https://heycam.github.io/webidl/#idl-nullable-type

```webidl
interface MyConstants {
  const boolean? ARE_WE_THERE_YET = false;
};
```

I couldn't find a real world example that uses nullable constant types. Why is it nullable? How is `const boolean?` different from `const boolean`?


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