[w3c/webpayments-methods-card] No description of BasicCardResponse's billingAddress (#30)

The [section on `BasicCardResponse`](https://w3c.github.io/webpayments-methods-card/#basiccardresponse) is missing a description of the `billingAddress` dictionary member; it has descriptions of the other 5 members.

(I got here from https://github.com/w3ctag/spec-reviews/issues/152.)

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