[w3c/payment-handler] Link fix: Addresses #166; another reference link fix (#172)

Two link fixes:
 * Payment Handler API section (issue 166)
 * Reference to payment method manifest spec
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/172

-- Commit Summary --

  * Two link fixes:

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/172.patch
https://github.com/w3c/payment-handler/pull/172.diff

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https://github.com/w3c/payment-handler/pull/172