[w3c/payment-handler] Fixed small things in the text and code example (#220)

- fixed small typos in the text
- fixed missing ')' in EXAMPLE 6
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/220

-- Commit Summary --

  * Fixed small things in the text and code example 

-- File Changes --

    M index.html (6)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/220.patch
https://github.com/w3c/payment-handler/pull/220.diff

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https://github.com/w3c/payment-handler/pull/220