`{introspection}`: Improvements for `introspection` pkg.

[chris-ramon]

Details

• Priority: Low.

Actual

There are pending improvements introduced via:

• Implement introspection package with SpecificationQuery method and tests #48

Expected

1- Add dot at the end of the following code comments:
https://github.com/graphql-go/compatibility-standard-definitions/pull/48/files#diff-34dec21d0b7bc7e55114d2ee8162a1d37073cdfde47e9e171aafbb680abc2271

2- Update TestSpecificationQuery log format to use %w for logging errors.

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