Adding missing information in setBillingAddressOnCart Mutation

[VinothKumar361]

Purpose of this pull request

This pull request (PR) is for adding missing information in setBillingAddresOnCart Mutation.The region and country fieds are set in request but didn't showed in response

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.3/graphql/mutations/set-billing-address.html

[devops-devdocs]

An admin must run tests on this PR before it can be merged.

[rogyar]

Example from the codebase:
https://github.com/magento/magento2/blob/5b5a08e5dc08eab0203169273c8e41604e3e0a06/app/code/Magento/QuoteGraphQl/etc/schema.graphqls#L217-L219
https://github.com/magento/magento2/blob/5b5a08e5dc08eab0203169273c8e41604e3e0a06/app/code/Magento/QuoteGraphQl/etc/schema.graphqls#L241
https://github.com/magento/magento2/blob/5b5a08e5dc08eab0203169273c8e41604e3e0a06/app/code/Magento/QuoteGraphQl/etc/schema.graphqls#L246

[rogyar]

Hi @VinothKumar361. I would not say this info is missing since the mentioned fields are not technically required. But it's really good to have this information in the example.

Thank you

[ghost]

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