Diogo Ferrao enhanced the authentication documentation for the stackit-sdk-go repository, focusing on improving developer onboarding and clarifying setup procedures. He restructured the README to clearly distinguish between key flow and token flow authentication methods, providing detailed, actionable configuration steps for each. Using Go and Markdown, Diogo applied technical writing skills to address common setup questions and reduce friction in the authentication workflow. The updated documentation aimed to streamline the onboarding process, making it easier for developers to understand and implement authentication. This work demonstrated a thoughtful approach to documentation, emphasizing clarity and usability without introducing new features or bug fixes.