Nikolay Samoiloff updated the WebSocket API Endpoints Documentation for the MetaMask/metamask-docs repository, ensuring that the listed endpoints for Arbitrum and Avalanche mainnets accurately reflected current network configurations. He approached this work by leveraging Markdown for clear technical writing and used Git-based version control to manage changes and maintain traceability through linked pull requests. By focusing on precise API integration details and thorough documentation practices, Nikolay improved the reliability of the reference material for developers. This update reduced potential user confusion and support requests, demonstrating careful attention to documentation quality and the ongoing maintenance of developer-facing resources.