[whatwg/streams] Reference defining "transforming [promise] by a fulfillment handler" ? (#622)

https://streams.spec.whatwg.org/commit-snapshots/872188a984722861020ae773a5ee558892797c33#readable-stream-tee

> by a fulfillment handler

Although it's quite obvious what this means, it would be nice if there was a reference defining it explicitly.

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