Fix comment and example typos in list.h, queue.h and task.h - #1460

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4.1.1, actions/setup-python@v3, lots0logs/gh-action-get-changed-files@2.2.2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/