[w3c/payment-handler] Updated examples.md - Formatting (#357)

Unsure if it's intentional, but tidied it up a little if that's helpful. 
Thanks!
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/357

-- Commit Summary --

  * Updated examples.md - Formatting

-- File Changes --

    M proposals/examples.md (16)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/357.patch
https://github.com/w3c/payment-handler/pull/357.diff

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