[whatwg/streams] Editorial: change underlyingSource to underlyingSink (#545)

The algorithm for the WritableStream constructor made reference to
"underlyingSource". Change it to "underlyingSink".
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/545

-- Commit Summary --

  * Editorial: change underlyingSource to underlyingSink

-- File Changes --

    M index.bs (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/545.patch
https://github.com/whatwg/streams/pull/545.diff

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