Shinya Kato contributed to the pgsql-jp/jpug-doc repository by addressing documentation consistency for WAL process terminology. Over the course of one month, he focused on refining technical documentation, specifically updating instances of 'WAL送信処理' to 'WAL送信プロセス' to align with established terminology. This targeted change, implemented using SGML and technical writing skills, aimed to reduce ambiguity for both contributors and users. By maintaining existing content and applying a low-risk patch, Shinya improved clarity and searchability within the documentation. His work enhanced onboarding for new contributors and minimized potential support queries related to inconsistent terminology in the project.