[whatwg/xhr] Fix small grammer (#234)

I think having the `being` would be a better sentence here? 👀

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

  https://github.com/whatwg/xhr/pull/234


-- Commit Summary --

  * Fix grammer

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/234.patch

https://github.com/whatwg/xhr/pull/234.diff


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