[whatwg/streams] Update Examples.md for api changes (#563)

Unless Examples.md should just be deleted entirely if there are strictly better examples elsewhere?

Also delete TeeStream.md since teeing was actually implemented in a very different way in 2015.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/563

-- Commit Summary --

  * Update Examples.md for api changes
  * delete TeeStream.md

-- File Changes --

    M Examples.md (49)
    D TeeStream.md (31)

-- Patch Links --

https://github.com/whatwg/streams/pull/563.patch
https://github.com/whatwg/streams/pull/563.diff

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