[whatwg/streams] Changes to Example 8.9: Fix code issue, add const, add text decode step (#924)

Hi WHATWG team, I want to propose the following changes to example 8.9 in order to clarify it to the reader:
- There was a closing brace missing which I've added.
- The `url` variable is used out of nowhere; I would recommend to take the one coming from the `fetchEvent` which comes close to a real world scenario when using a ServiceWorker.
- The example won't work in browsers as the response body is binary-encoded but the `LipFuzzTransformer` requires string chunks. Therefor, I would recommend adding a text decoding step before applying the former. Hence, the reader is able to try the example out in her/his browser.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/924

-- Commit Summary --

  * Add missing brace in example 8.9
  * Define a `url` constant for clarity in example 8.9
  * Add a text decoding step to example 8.9

-- File Changes --

    M index.bs (17)

-- Patch Links --

https://github.com/whatwg/streams/pull/924.patch
https://github.com/whatwg/streams/pull/924.diff

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