[whatwg/streams] Add a text encoding step to example 8.9 (#930)

In #924, a text decoding step was added to example 8.9 so it could run in the browser. However, the reverse needs to happen in order to construct a valid `Response` with the transformed stream. Specifically, in step 3 of "read all bytes from a ReadableStream" from [the Fetch specification](https://fetch.spec.whatwg.org/#concept-read-all-bytes-from-readablestream), the stream must produce `Uint8Array` objects for it to be consumed correctly.

This PR fixes this by adding an extra pipe through a `TextEncoderStream`.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/930

-- Commit Summary --

  * Add a text encoding step to example 8.9

-- File Changes --

    M index.bs (4)

-- Patch Links --

https://github.com/whatwg/streams/pull/930.patch
https://github.com/whatwg/streams/pull/930.diff

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