[📑 Docs]: Normalize structure: Generate IAM Policies with IAM Policy Stream

What docs changes are you proposing?

Source: https://docs.localstack.cloud/aws/tutorials/iam-policy-stream/

What’s missing

• Intro
• Prerequisites
• Architecture diagram
• Steps
• Testing the application
• Conclusion

Proposed edits

• Add ## Architecture diagram.
• Add ## Testing the application with sample allow/deny outputs.

Acceptance criteria

• Diagram + Testing the application present with sample outputs.

Code of Conduct

• I agree to follow this project's Code of Conduct