[w3c/payment-method-id] Fix link to implementation report (#58)

Two different URLs in the doc; one seems to work the other doesn't, so this replaces the one that doesn't work.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-method-id/pull/58

-- Commit Summary --

  * removed extra "the"
  * Merge branch 'gh-pages' of github.com:w3c/payment-method-id into gh-pages
  * implementation report link fix (I think)

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-method-id/pull/58.patch
https://github.com/w3c/payment-method-id/pull/58.diff

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