[browser-payment-api] Add a reference to issue #51. (#85)

Add a reference to issue #51.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/85

-- Commit Summary --

  * Remove trailing whitespace.
  * Add reference to issue #51.

-- File Changes --

    M specs/paymentrequest.html (93)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/85.patch
https://github.com/w3c/browser-payment-api/pull/85.diff

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