docs(cloudfront): updates to CloudFront ResponseHeadersPolicy XSSProtection

[awslukeguan]

Issue # (if applicable)

Closes #20962

Reason for this change

Update the documentation to have a deployable example.

Description of changes

Set modeBlock to false when reportUri is set.
You cannot specify a ReportUri when ModeBlock is true.

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-cloudfront-responseheaderspolicy-xssprotection.html

Description of how you validated changes

Updated the tests

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

Pull request has been modified.

Pull request has been modified.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: d9c61a6
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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