[w3c/ServiceWorker] Cache API Vary header processing should be clarified (Issue #1609)

> Let fieldValues be the list containing the elements corresponding to the field-values of the Vary header for the value of the header with name `Vary`.

This needs to be rewritten on top of https://fetch.spec.whatwg.org/#concept-header-list-get (or perhaps the algorithm below "get, decode, and split") as this sentence makes little sense.

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