[w3c/ServiceWorker] consider adding a note that response body may be re-buffered in browser (#1573)

When a response is passed to respondWith() most (all?) browsers will end up serializing the body through some kind of data pipe with a fixed capacity.  This means that a response constructed with a ReadableStream body may see the data chunks get re-buffered into different size chunks on the other side.  It would be nice if the spec captured this in some way.  Perhaps as a note if it can't really be represented in normative text.

Not sure if this should be here or in fetch.  cc @annevk 

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