[whatwg/streams] Add a link to web-platform-tests to the top of the spec (#737)

A few other specs that have something similar:
https://fetch.spec.whatwg.org/
https://w3c.github.io/IndexedDB/
https://notifications.spec.whatwg.org/
https://xhr.spec.whatwg.org/
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/737

-- Commit Summary --

  * Add a link to web-platform-tests to the top of the spec

-- File Changes --

    M index.bs (1)

-- Patch Links --

https://github.com/whatwg/streams/pull/737.patch
https://github.com/whatwg/streams/pull/737.diff

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