[whatwg/fetch] ABNF Notation Reference (#489)

In the [Infrastructure](https://fetch.spec.whatwg.org/#infrastructure) section, the Fetch spec only links to to only one [ABNF spec (rfc5234)](https://tools.ietf.org/html/rfc5234). However the Fetch spec uses custom w3 defined syntax `<a>#<b>` in many places, such as [here](https://fetch.spec.whatwg.org/#http-new-header-syntax).

The custom w3 syntax defined at [https://www.w3.org/Notation.html](https://www.w3.org/Notation.html) should be linked somewhere.

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