[w3c/payment-request] Editorial: fixed grammatical errors (#790)

- Fixed grammatical errors
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/790

-- Commit Summary --

  * Editorial: fixed grammatical errors

-- File Changes --

    M index.html (8)

-- Patch Links --

https://github.com/w3c/payment-request/pull/790.patch
https://github.com/w3c/payment-request/pull/790.diff

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