[whatwg/encoding] Editorial: remove a lone close parenthesis (#216)

This was left over from #175.


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<a href="https://whatpr.org/encoding/216.html" title="Last updated on May 29, 2020, 2:05 PM UTC (893f58b)">Preview</a> | <a href="https://whatpr.org/encoding/216/dd8e302...893f58b.html" title="Last updated on May 29, 2020, 2:05 PM UTC (893f58b)">Diff</a>
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  https://github.com/whatwg/encoding/pull/216

-- Commit Summary --

  * Editorial: remove a lone close parenthesis

-- File Changes --

    M encoding.bs (2)

-- Patch Links --

https://github.com/whatwg/encoding/pull/216.patch
https://github.com/whatwg/encoding/pull/216.diff

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