Marcel Stranak contributed targeted documentation improvements to the localstack/docs repository, focusing on clarifying Lambda debugging port limitations. He authored a detailed note explaining that only one Lambda function can be debugged at a time due to the way debugger ports are published, and directed users with advanced multi-port needs to the Lambda Debug Mode preview. Marcel used Markdown to ensure the documentation was clear and accessible, aligning the content with the current debugger architecture. His work addressed issue #1542, enhancing traceability and onboarding efficiency. The update demonstrated depth in documentation skills and a strong understanding of developer workflows and user needs.