[whatwg/xhr] Remove outdated note from setRequestHeader() (#215)

A tiny and first pull request for https://github.com/whatwg/xhr/issues/213

:)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/215

-- Commit Summary --

  * Remove outdated note from setRequestHeader()

-- File Changes --

    M xhr.bs (7)

-- Patch Links --

https://github.com/whatwg/xhr/pull/215.patch
https://github.com/whatwg/xhr/pull/215.diff

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