Lingfeng Sun updated the RDKS100 hardware testing and audio documentation for the D-Robotics/rdk_doc repository, focusing on improving developer guidance and reducing setup errors. Using Markdown and technical writing skills, Lingfeng corrected file paths for hardware unit tests and added detailed configuration notes for graphical audio support. This work enhanced the accuracy and completeness of the documentation, enabling developers to set up and validate hardware tests more efficiently. The changes, merged under a dedicated commit, addressed onboarding challenges and streamlined hardware qualification cycles. The depth of the update reflects careful attention to documentation structure and clarity, supporting reliable developer workflows.