[w3c/webpayments-methods-tokenization] Relationship between TokenizedCard and EncryptedTokenizedCard needs clarification (#35)

Creating an individual issue from the list in #26 in reference to:
  https://github.com/w3c/webpayments-methods-tokenization/wiki/Tokenized-Card

"The relationship between TokenizedCard and EncryptedTokenizedCard is not clear (probably because currently we're punting on the encryption methods). At least this should be called out. More specifically, we should more carefully define the various fields (especially cryptogram, typeOfCryptogram, eci, trid), describe why each one needs to be included as input to the encryption operation (at least that's what they seem to be, but it's unspecified), describe which ones are required and which ones are optional, etc."

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https://github.com/w3c/webpayments-methods-tokenization/issues/35