[w3c/gamepad] Editorial: clean up xrefs (#147)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/pull/147.html" title="Last updated on Mar 17, 2021, 9:57 AM UTC (a3367e6)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/gamepad/147/f7efbb8...a3367e6.html" title="Last updated on Mar 17, 2021, 9:57 AM UTC (a3367e6)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/147

-- Commit Summary --

  * Editorial: clean up xrefs

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/gamepad/pull/147.patch
https://github.com/w3c/gamepad/pull/147.diff

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