[whatwg/streams] Editorial changes to transferable streams explainer (#977)

* Make some language clearer.
* Add a section about end-user benefit.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/977

-- Commit Summary --

  * Editorial changes to transferable streams explainer

-- File Changes --

    M transferable-streams-explainer.md (15)

-- Patch Links --

https://github.com/whatwg/streams/pull/977.patch
https://github.com/whatwg/streams/pull/977.diff

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