Re: [fetch] link BufferSource to definition (#108)

They're *like* interfaces. Close enough, at least.  Same with `any`, etc.  When I finally Bikeshed WebIDL like I've been threatening to, they'll be marked up as such.  (Well, `any` is probably a typedef. Doesn't super matter; they're all linkable with the `{{idl}}` shorthand without having to know the type.)

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