[w3c/payment-request] (Editorial) typo fix (#832)

Change a -> an

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/832

-- Commit Summary --

  * typo fix

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/832.patch
https://github.com/w3c/payment-request/pull/832.diff

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