[w3c/payment-request] updateWith accepts a details object? (#657)

I noticed the doc note [here](https://www.w3.org/TR/payment-request/#updatewith()-method):
> If a developer wants to update the payment request, then they need to call updateWith() and provide a PaymentDetailsUpdate dictionary, or a promise for one, containing changed values that the user agent presents to the user.

The bit that's interesting is the a developer may provide a PaymentDetailsUpdate dictionary object *(so not a promise)* but the IDL and the spec steps describe only the `detailsPromise`.

Google dev docs show `updateWith` accepting a vanilla object too  ([here](https://developers.google.com/web/fundamentals/payments/deep-dive-into-payment-request#defining_the_available_shipping_options) and [here](https://developers.google.com/web/fundamentals/payments/deep-dive-into-payment-request#customizing_the_shipping_options_error)).
And Google's implementation appears to accept vanilla objects too.

Does the spec text need to be updated or am I missing something?



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