Links on guide page redirects to API reference 4.x

**Platform**: Linux db 6.17.0-8-generic #8-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14 21:44:46 UTC 2025 x86_64 GNU/Linux **Any other relevant information**: Can be reproduced through Mobile and Desktop ## What steps will reproduce the bug? 1. Visit https://expressjs.com/en/guide/writing-middleware.html 2. Click on `request object` (link) or 3. Redirects to API reference 4.x ## What I have done 1. Checked the code from `gh-pages` branch, ~~the links are up to date and mentions API reference 5.x~~