[whatwg/streams] Remove the warning about writable stream spec stability (#710)

As can be seen by the remaining issue count and few recent changes, we have stabilized the spec.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/710

-- Commit Summary --

  * Remove the warning about writable stream spec stability

-- File Changes --

    M index.bs (5)

-- Patch Links --

https://github.com/whatwg/streams/pull/710.patch
https://github.com/whatwg/streams/pull/710.diff

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https://github.com/whatwg/streams/pull/710