Remove a false performance claim in addRowMultiple, and the dead macros behind it - #77

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: editorconfig-checker/action-editorconfig-checker@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/