[whatwg/xhr] Meta: remove mention of CC0 (#187)

Also fix a couple other nits.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/187

-- Commit Summary --

  * Meta: remove mention of CC0

-- File Changes --

    M CONTRIBUTING.md (2)
    M README.md (2)
    M xhr.bs (7)

-- Patch Links --

https://github.com/whatwg/xhr/pull/187.patch
https://github.com/whatwg/xhr/pull/187.diff

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https://github.com/whatwg/xhr/pull/187