[w3c/payment-request] Tidied up document using tidy-html5 (PR #1063)

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<a href="https://pr-preview.s3.amazonaws.com/w3c/payment-request/pull/1063.html" title="Last updated on Mar 26, 2026, 7:47 PM UTC (f47aeda)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-request/1063/0e99859...f47aeda.html" title="Last updated on Mar 26, 2026, 7:47 PM UTC (f47aeda)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/1063?email_source=notifications&email_token=AEHSJBV2H7DHYXUNYVHGKYT4SWCOLA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINJTGQ2DSNZVG2THEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3POBSW4X3DNRUWG2Y

-- Commit Summary --

  * chore(tidy): tidy up document

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-request/pull/1063.patch?email_source=notifications&email_token=AEHSJBWPWGBN76GWD2PHOC34SWCOLA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINJTGQ2DSNZVG2THEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVZYHEX3QMF2GG2C7MNWGSY3Lhttps://github.com/w3c/payment-request/pull/1063.diff?email_source=notifications&email_token=AEHSJBQPTDOF36CV6JUI7NL4SWCOLA5CNFSNUABEM5UWIORPF5TWS5BNNB2WEL2QOVWGYUTFOF2WK43UF4ZTINJTGQ2DSNZVG2THEZLBONXW5KTTOVRHGY3SNFRGKZFFMV3GK3TUVVYHEX3ENFTGMX3DNRUWG2Y
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