[w3c/payment-request] Editorial: describe purpose of retry() (#934)

closes #933

Describe's `retry()`'s expected usage + talks about the end user being able to basically change all the things. 

@SECtim, wdyt? 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/934

-- Commit Summary --

  * Editorial: describe purpose of retry()

-- File Changes --

    M index.html (26)

-- Patch Links --

https://github.com/w3c/payment-request/pull/934.patch
https://github.com/w3c/payment-request/pull/934.diff

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