[heycam/webidl] ObservableArray is in DistinguishableType production but is not in distinguishable table (#999)

* https://heycam.github.io/webidl/#prod-DistinguishableType

  > ```
  > DistinguishableType ::
  >     PrimitiveType Null
  >     StringType Null
  >     identifier Null
  >     sequence < TypeWithExtendedAttributes > Null
  >     object Null
  >     symbol Null
  >     BufferRelatedType Null
  >     FrozenArray < TypeWithExtendedAttributes > Null
  >     ObservableArray < TypeWithExtendedAttributes > Null
  >     RecordType Null
  > ```

* https://heycam.github.io/webidl/#dfn-distinguishable

If it's intentionally not distinguishable, I think it shouldn't be in DistinguishableType.

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