[heycam/webidl] extended attributes (#330)

There are five grammar symbols / forms listed in the table near the top of the Extended Attributes section.
The two paragraphs either side of the table refer to six grammar symbols / forms.

https://www.w3.org/TR/WebIDL-1/#dfn-extended-attribute
https://heycam.github.io/webidl/#idl-extended-attributes

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