[w3c/browser-payment-api] Add explicit note that shippingOptions is only required if requesting shipping (#128)

In TAG review @triblondon said:

>> If the sequence is empty, then this indicates that the merchant cannot ship to the current shippingAddress.

> shippingOptions appears not to support the idea of a transaction that does not require shipping (eg a digital service). This is covered off by the PaymentOptions interface but it would be worth clarifying that shippingOptions is only expected to be supplied by the merchant when they are also requesting shipping address in PaymentOptions



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