[w3c/payment-request] Typo fix (#623)

The numbers didn't add up.

Fixes #622
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/623

-- Commit Summary --

  * Typo fix

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/payment-request/pull/623.patch
https://github.com/w3c/payment-request/pull/623.diff

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