[w3c/payment-request] Section 3.11 (onpaymentmethodchange attribute) mentions the wrong event interface (#769)

Here's what it says:

```
3.11 onpaymentmethodchange attribute

A PaymentRequest's onpaymentmethodchange attribute is an EventHandler for a PaymentRequestUpdateEvent named "paymentmethodchange". 
```

I think this should be "... is an EventHandler for a PaymentMethodChangeEvent ...".

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