[w3c/payment-handler] Removed section on instrument grouping with closure of issue 153 (#213)

Suggest removing this section since we are no longer supporting wallets.
We have moved information to the developer portal:
https://github.com/w3c/payment-request-info/wiki/PaymentAppPractice
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/213

-- Commit Summary --

  * Removed section on instrument grouping with closure of issue 153

-- File Changes --

    M index.html (41)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/213.patch
https://github.com/w3c/payment-handler/pull/213.diff

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https://github.com/w3c/payment-handler/pull/213