[whatwg/fetch] Describe "transfer a body" algorithm (#450)

Currently it is described in https://w3c.github.io/ServiceWorker/#dom-fetchevent-respondwith and https://w3c.github.io/ServiceWorker/#dom-foreignfetchevent-respondwith but having the algorithm in Fetch would be helpful.

Note: A refactoring is planned when pipeTo and transform stream is ready (see https://github.com/whatwg/fetch/issues/330#issuecomment-234462140). I'll do this work along with the refactoring.

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