[heycam/webidl] CallbackInterfaceMembers grammar question (typo?) (#751)

```
CallbackInterfaceMembers ::
    ExtendedAttributeList CallbackInterfaceMember CallbackInterfaceMember
    ε
```

It seems like the second `CallbackInterfaceMember` should be `CallbackInterfaceMembers` (plural). I know there can be only one `RegularOperation` (not enforced syntactically), but I don’t think the number of consts is limited (assuming [NodeFilter](https://dom.spec.whatwg.org/#interface-nodefilter) is instructive).

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