[w3c/browser-payment-api] "User accepts the payment request algorithm" needs to clarify where Payment Handlers are invoked (#476)

Currently the documented algorithm has the following issues;

1. Unclear separation of concerns makes payment handler functionality ambiguous
2. as a result, brittle specification between payment handler spec and payment request spec (changes to algorithm in payment request makes algorithm in payment handlers incorrect) - for example see that in payment handlers, it current states that it replaces steps 6 & 7, whereas this is incorrect and it should be steps 7 & 8 (probably as a result of a removed step in PaymentRequest algorithm).

With the recently matured Payment Handlers specification having specified amendments to this algorithm, I recommend that the algorithm is updated in the PaymentRequest specification to clearly define a separation of concerns  between the mediators and the payment handlers.


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https://github.com/w3c/browser-payment-api/issues/476