Re: [whatwg/fetch] Add support for stale-while-revalidate handling (#852)

@ziyunfei I've added text for handling must-revalidate. Please take another look.

@mnot SwR handling is only triggered when a stale resource (which had a `Cache-Control` directive set on a previous response) is accessed and returned. So a subsequent request that accesses a stale resource needs to execute first and thus being triggered by a fetch.

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