[w3c/selection-api] Use stringifier shorthand syntax (#131)

https://github.com/heycam/webidl/pull/941 intends to remove the longhand since no other spec uses it.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/131.html" title="Last updated on Dec 19, 2020, 10:48 AM UTC (d383b8f)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/131/8a39318...d383b8f.html" title="Last updated on Dec 19, 2020, 10:48 AM UTC (d383b8f)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/131

-- Commit Summary --

  * Use stringifier shorthand syntax

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/selection-api/pull/131.patch
https://github.com/w3c/selection-api/pull/131.diff

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https://github.com/w3c/selection-api/pull/131