[whatwg/streams] Add explainer for WritableStreamDefaultController's AbortSignal (#1162)

Add writable-stream-abort-signal-explainer.md.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1162

-- Commit Summary --

  * Merge pull request #1 from whatwg/master
  * Merge pull request #2 from whatwg/master
  * Merge pull request #3 from whatwg/master
  * Merge remote-tracking branch 'upstream/master'
  * Merge remote-tracking branch 'upstream/master'
  * Merge branch 'whatwg:main' into master
  * add abort signal explainer
  * add some more links

-- File Changes --

    A writable-stream-abort-signal-explainer.md (118)

-- Patch Links --

https://github.com/whatwg/streams/pull/1162.patch
https://github.com/whatwg/streams/pull/1162.diff

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