Worked on the phpstan/phpstan-src repository to enhance developer documentation, focusing on improving clarity and accuracy for contributors. Addressed a documentation bug by updating the README to specify the correct PHP version required for development and refining grammar to reduce ambiguity. Utilized Markdown to ensure the documentation was both readable and technically precise, aligning onboarding materials with current project requirements. This work reduced the risk of misconfiguration and streamlined the onboarding process for new contributors. No core features were added or modified, and the changes maintained the integrity of existing tests and functionality while elevating the overall quality of project documentation.