Carlos Rogue enhanced the http4s/http4s repository by improving documentation for the Mill quickstart process, focusing on Scala project onboarding. He introduced detailed Markdown guides that added support for Scala 2.x Mill giter8 templates and provided clear instructions for initializing and running projects with Mill as an alternative to sbt. His work standardized references to the Mill build tool and clarified naming conventions throughout the quickstart guide, reducing confusion for new contributors. By refining code blocks and improving cross-linking within the documentation, Carlos streamlined navigation and helped lower onboarding time, demonstrating depth in technical writing and documentation best practices.