[w3c/payment-handler] Fix shippingOptions and PaymentOption links to point to Payment Request API (#356)

closes #355

I also manually fixed the spacing inside ```<ol></ol>``` tags where tidy (5.6.0) had deleted spaces after closing tags:
e.g tidy converts ```For each <var>member</var> in...``` to ```For each <var>member</var>in...``` deleting the space between ```</var>``` and ```in```.


You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/356

-- Commit Summary --

  * Fix shippingOptions and PaymentOption links

-- File Changes --

    M index.html (34)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/356.patch
https://github.com/w3c/payment-handler/pull/356.diff

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