[w3c/payment-request] Permissible data changes during a retry (#933)

Hi! While reading up on @crowgames's findings about the retry mechanism (#882, #904), I was a bit confused by the following statement:

> A user cannot switch payment handlers during retry. **One can only change the things being retried** (eg. new credit card expiry date).

_Originally posted by @marcoscaceres in https://github.com/w3c/payment-request/issues/882#issuecomment-549197510_

My understanding would be that _"the things being retried"_ refers to the `errorFields` argument of `retry()`. This led me to [the description](https://github.com/w3c/payment-request/blob/e71e17d5a646f708a22ba93b79349bc60374385e/index.html#L3088-L3224) of how a user agent must handle a `retry()` call.
According to my understanding of that description, the user agent does not need to restrict modifications to the fields indicated by `errorFields`.

Did I overlook the respective instructions in the spec? If not, I think it would make sense to clarify the specifications in that aspect.

Cheers

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