[whatwg/streams] Match _closeWS parameter name with name used in body (#971)

`reasonString` is used to match the closeWS(code, reasonString)
function in section 8.6.

Fixed #915 
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/971

-- Commit Summary --

  * Match _closeWS parameter name with name used in body

-- File Changes --

    M index.bs (3)

-- Patch Links --

https://github.com/whatwg/streams/pull/971.patch
https://github.com/whatwg/streams/pull/971.diff

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