[whatwg/streams] Fix example for identity transform (#881)

The example code for using an identity transform streams is wrong. It should use a writer in order to write to the stream.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/881

-- Commit Summary --

  * Fix example for identity transform

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/whatwg/streams/pull/881.patch
https://github.com/whatwg/streams/pull/881.diff

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https://github.com/whatwg/streams/pull/881