[whatwg/streams] fix error description (#596)

Oops, realized I forgot this in #592.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/596

-- Commit Summary --

  * fix error description

-- File Changes --

    M reference-implementation/lib/readable-stream.js (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/596.patch
https://github.com/whatwg/streams/pull/596.diff

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https://github.com/whatwg/streams/pull/596