[w3c/payment-handler] Editorial: fix up HTML xrefs (#387)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-handler/pull/387.html" title="Last updated on Apr 26, 2021, 9:38 AM UTC (17f23c1)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-handler/387/7d1333e...17f23c1.html" title="Last updated on Apr 26, 2021, 9:38 AM UTC (17f23c1)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/387

-- Commit Summary --

  * Editorial: fix up HTML xrefs

-- File Changes --

    M index.html (11)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/387.patch
https://github.com/w3c/payment-handler/pull/387.diff

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