[w3c/payment-handler] Removed note on payment method manifest and added reference to it (#311)

Since that spec has now been published. Refer to canMakePaymetn() algorithm
for more info on authorized payment apps

Relates to #308 but does not close it. 

The following tasks have been completed:

 * [ ] web platform tests (link)
 * [ ] MDN Docs added (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/311

-- Commit Summary --

  * Removed note on payment method manifest and added reference to it, since

-- File Changes --

    M index.html (33)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/311.patch
https://github.com/w3c/payment-handler/pull/311.diff

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