Re: [fetch] "Let preflightResponse be the result of performi..." (#174)

Like we discussed in #whatwg, there could be some notes added to HTTP Fetch and the CORS-preflight Fetch regarding the purpose of the CORS-preflight cache.

Step 4.1 of HTTP Fetch could say something like "If there's a CORS-preflight cache match, then this request is validated already. If there isn't, it needs to be validated."

CORS-preflight Fetch could have more detail about what it means for it to be validated, and how it gets stored in a cache to prevent redundant checks.

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