[w3c/browser-payment-api] show() method lacks developer guidance (#461)

In `show()`, the following exceptions don't provide developer guidance in the message: 

> If the value of request.[[state]] is not " created" then throw an "InvalidStateError" DOMException.

> If this consultation produced no supported method of paying, then reject acceptPromise with a "NotSupportedError" DOMException, and abort this algorithm.


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