Worked on documentation improvements for the elixir-lang/elixir and phoenixframework/phoenix repositories, focusing on clarifying core behaviors and reducing user confusion. Enhanced the DynamicSupervisor documentation in Elixir to accurately describe the :already_started behavior, ensuring that duplicate child spec IDs are ignored while duplicate registered names still trigger errors. In Phoenix, clarified the Flash API documentation for put_flash/3, specifying that any atom or binary can serve as a flash key and that default generator keys are :info and :error. Leveraged Elixir and documentation best practices to align documentation with runtime behavior, improving onboarding and reducing support overhead for both projects.