Re: [w3c/payment-handler] Payment Instrument architecture clarification (#381)

The `registration.paymentManager.instruments.set()` can be called multiple times, as long as the instrument key is different every time. (If you re-use the same key, then the old data will be overwritten.) This enables one payment handler to have multiple instruments.

The `method: 'https://bobpay.xyz/pay'` parameter specifies the `"payment method identifier"`.

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