[w3c/browser-payment-api] Editorial: firing an event is not done correctly (#401)

E.g.

> 1. Let event be a new PaymentRequestUpdateEvent.
> 2. Queue a task to fire an event named name of type event at request. 

should be

> 1. Queue a task to fire an event named _name_ at _request_ using `PaymentRequestUpdateEvent`.

Note that this requires referencing the DOM Standard, which defines fire an event correctly, instead of DOM4, which does not allow using non-`Event` interfaces, or DOM 4.1, which does not define it at all.

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