[w3c/webpayments-payment-handler] Fix to prevent duplicate ids by respec (#145)

If you reference an issue mulitple times in the spec, for example:

<p class="issue" data-number="98"></p>

respec generates duplicate ids. So this edit removes that construct
in favor of some explicit links.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-handler/pull/145

-- Commit Summary --

  * If you reference an issue mulitple times in the spec, for example:

-- File Changes --

    M index.html (10)

-- Patch Links --

https://github.com/w3c/webpayments-payment-handler/pull/145.patch
https://github.com/w3c/webpayments-payment-handler/pull/145.diff

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