Re: [fetch] Fix #197: explain cache modes (a47e1e4)

The canonical reference (until the WHATWG gets around to replacing it) is [RFC7232: HTTP/1.1 Conditional Requests](http://httpwg.org/specs/rfc7232.html). 

The language above is confusing, though; how can it create a conditional request if nothing was in the cache?

I suspect what you mean to say is "Fetch will inspect the HTTP cache on the way to the network. If a fresh response is found, it will be used. Otherwise, a request will be sent to the network; if the cache has a response but it is stale, the request will be conditional."

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