[w3c/payment-request] Clarify that empty region/regionCode is ok for some locales (#710)

In https://github.com/w3c/payment-request/issues/663#issuecomment-389409558 @mnoorenberghe wrote:

> ... Since users won't expect to be asked to select their subdivision for a shipping address in some countries that don't use them for mailing, I expect that in Firefox we won't show a subdivision field and therefore won't populate the region or regionCode fields for those countries such as Belgium, Germany, etc. **Perhaps the spec and/or MDN should be more clear that an empty string can be valid for mailing purposes.**

Should add a note to the spec as per above👆

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