fix(appsync): correct the schema definition for the sample code

[azarboon]

Issue # (if applicable)

Closes #32848

Reason for this change

The current sample schema is incorrect and causes the stack deployment to fail.

Description of changes

I modified the sample GraphQL schema so that it is successfully deployed.

Describe any new or updated permissions being added

<!— What new or updated IAM permissions are needed to support the changes being introduced ? -->

Description of how you validated changes

I was able to successfully deploy the stack after making the changes I already proposed in the PR.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0fb6fc7
• Result: FAILED
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