[w3c/browser-payment-api] Add explicit note that shippingOptions is only required if requesting… (#171)

… shipping

Fixes #128.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/171

-- Commit Summary --

  * Add explicit note that shippingOptions is only required if requesting shipping

-- File Changes --

    M specs/paymentrequest.html (3)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/171.patch
https://github.com/w3c/browser-payment-api/pull/171.diff

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https://github.com/w3c/browser-payment-api/pull/171