[w3c/webpayments-methods-card] Add text about why the api can reduce need to store credit card information (#18)

Updated PR to address https://github.com/w3c/webpayments-methods-card/issues/16
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-methods-card/pull/18

-- Commit Summary --

  * Update index.html
  * Update index.html

-- File Changes --

    M index.html (30)

-- Patch Links --

https://github.com/w3c/webpayments-methods-card/pull/18.patch
https://github.com/w3c/webpayments-methods-card/pull/18.diff

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https://github.com/w3c/webpayments-methods-card/pull/18