[whatwg/streams] Editorial: consistently use minimal returns (#612)

That is, just say "return" instead of "return undefined", and don't return explicitly at the end of algorithms. Fixes #587.

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Unlike fbe8b561a0021d0ef3e7955f8c7380baef47c1f0 I'm not as confident I caught everything here, so I'm putting this up as a PR instead of commiting directly to master, in case someone else wants to take a second look.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/612

-- Commit Summary --

  * Editorial: consistently use minimal returns

-- File Changes --

    M index.bs (28)

-- Patch Links --

https://github.com/whatwg/streams/pull/612.patch
https://github.com/whatwg/streams/pull/612.diff

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