[w3c/payment-request] Remove "standardized payment method identifier" content (#965)

This passage is outdated because basic-card has been deprecated.

"Each standardized payment method identifier defines its own unique IDL dictionary for use with the details attribute. The shape of this data (i.e., its members and their corresponding types and formats) differs depending on which standardized payment method identifier is selected by the end user."

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https://github.com/w3c/payment-request/issues/965