[w3c/payment-handler] Normative MUSTs inside a non-normative note (#268)

https://w3c.github.io/payment-handler/#windows

Probably these should just be normative statements, not in a note.

> A single payment handler SHOULD NOT be allowed to open more than one client window using this method. 

This could be normatively enforced in the openWindow() algorithm, right?

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