[heycam/webidl] Can SpecialOperation be more simplified? (#470)

Currently [SpecialOperation](https://heycam.github.io/webidl/#prod-SpecialOperation) allows multiple keywords before RegularOperation:

```
SpecialOperation ::
    Special Specials RegularOperation
Specials ::
    Special Specials
    ε
Special ::
    getter
    setter
    deleter
```

This was required before #44 to allow `setter creator void set(DOMString name, any value);` but now it seems no IDL uses `getter setter`, `setter deleter`, etc.

So I think SpecialOperation can just be `Special RegularOperation`, what do you think?

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