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

[azarboon]

Issue #32889

Closes #32889

Reason for this change

The current sample schema is incorrect and causes stack deployment to fail. As per @samson-keung's instructions, I’ve created this new PR to address the issue.

Description of changes

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

Describe any new or updated permissions being added

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.48%. Comparing base (2b2443d) to head (a84bd52).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32982   +/-   ##
=======================================
  Coverage   81.48%   81.48%           
=======================================
  Files         226      226           
  Lines       13768    13768           
  Branches     2416     2416           
=======================================
  Hits        11219    11219           
  Misses       2271     2271           
  Partials      278      278           

Flag	Coverage Δ
suite.unit	81.48% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	80.89% <ø> (ø)
packages/aws-cdk-lib/core	82.10% <ø> (ø)

[azarboon]

@samson-keung this is the new PR created as per your instructions. Currently, one of the automated checks has failed for an unrelated reason. I believe it might be temporary, as I only made a brief edit to the README file.

Please review and let me know how to proceed.

[samson-keung]

Sorry for making you creating this PR. I thought this would be needed to resolve the CodeCov transient error. Closing this now.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a84bd52
• Result: SUCCEEDED
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