Teh Ming Han contributed to the MicrosoftDocs/powerbi-docs repository by addressing a documentation issue related to the AddTax TMDL function. He identified and corrected a malformed multiline expression, focusing on syntax and indentation improvements using Markdown. His work enhanced the stability and clarity of the example, making it easier for readers to understand and apply the function in their own Power BI projects. By refining the documentation, Teh Ming Han reduced ambiguity and potential support requests, ensuring the material was review-ready for integration into the next release. His efforts demonstrated attention to detail and a strong grasp of documentation best practices.