[whatwg/streams] Editorial: fix links to WritableStreamController methods (#1120)

As it says on the tin. 😁

(No behavior changes, so no tests or implementation bugs needed.)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1120


-- Commit Summary --

  * Fix links to WritableStreamController methods
  * Fix link to variable

-- File Changes --

    M index.bs (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/1120.patch

https://github.com/whatwg/streams/pull/1120.diff


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