[whatwg/encoding] Fix typo (#255)

I replaced `wih` by `with`. That’s it.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/255


-- Commit Summary --

  * Update encoding.bs

-- File Changes --

    M encoding.bs (2)

-- Patch Links --

https://github.com/whatwg/encoding/pull/255.patch

https://github.com/whatwg/encoding/pull/255.diff


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