Donn Felker enhanced the developer experience for the Editor API in the basecamp/lexxy repository by updating its documentation to clarify how to access the File object when a file is accepted by the editor. He revised the README, specifying that the file should be accessed via event.detail.file, which aligns with the actual API behavior and reduces confusion during integration. This work focused on improving onboarding and usage clarity for developers interacting with the API. Donn utilized Markdown for documentation and applied his skills in technical writing to ensure the update was precise, addressing a targeted need without introducing code changes.