Worked on enhancing the MicrosoftDocs/sdk-api repository by updating documentation for the ICustomDestinationList interface in the SDK API. Focused on improving clarity around known destination categories, the work introduced the new KDC_NONE constant and clarified the roles of KDC_FREQUENT and KDC_RECENT. Using Markdown and leveraging strong documentation skills, the developer aligned the documentation with actual API behavior, which helps streamline developer onboarding and reduces confusion for integrators. The changes aimed to make integration smoother and decrease support requests by providing more precise technical references. No bugs were fixed during this period, with all efforts concentrated on documentation improvements.