[whatwg/fetch] Add a dfn for about:blank (Issue #1951)

gsnedders created an issue (whatwg/fetch#1951)

### What is the issue with the Fetch Standard?

HTML tries to xref about:blank to Fetch: https://html.spec.whatwg.org/multipage/infrastructure.html#about:blank

However, Fetch doesn't actually explicitly define it anywhere — it's just effectively defined within https://fetch.spec.whatwg.org/#concept-scheme-fetch

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