[w3c/payment-request] ISO 4217 note commentary (#949)

5. PaymentCurrencyAmount dictionary 
https://www.w3.org/TR/2020/CR-payment-request-20201203/#paymentcurrencyamount-dictionary

> Efforts are underway at ISO to account for digital currencies, which may result in an update to the [ISO4217] registry or an entirely new registry. The community expects this will resolve ambiguities that have crept in through the use of non-standard 3-letter codes; for example, does "BTC" refer to Bitcoin or to a future Bhutan currency? At the time of publication, it remains unclear what form this evolution will take, or even the time frame in which the work will be completed. The W3C Web Payments Working Group is liaising with ISO so that, in the future, revisions to this specification remain compatible with relevant ISO registries. 

I18N discussed this in our teleconference of 2021-03-25. Generally, we think that Web Payments's liaison with 4217's RA is the right course of action. The only callout here is that this note might encourage implementers to consider non-standard/private-use "de facto" currency codes in the interim (before non-governmental currencies get addressed) where this might harm interoperability vs. having a solid standard.

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