[w3c/payment-request] Missing exported definition of payment request options (#890)

The [payment method basic card spec](https://github.com/w3c/payment-method-basic-card) has a `data-cite` that links to payment request options. However, that definition is not yet exported to respec's xref.

https://github.com/w3c/payment-method-basic-card/blob/df6b49d757bdae56fb5197a40085cc53ddfcd95e/index.html#L299-301

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