docs(Form): Update Form validation examples - #3813

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/