[w3c/payment-handler] Examples involving storedInstrument seem broken (#316)

There's several instances of code like:
```js
const { storedInstrument } =
  await registration.paymentManager.paymentInstruments.get(instrumentKey);
```
where `get` resolves with a `PaymentInstrument`. This JS syntax would appear to read the `storedInstrument` property of the `PaymentInstrument`, which doesn't exist.

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https://github.com/w3c/payment-handler/issues/316