I have tried other browsers and phone browsers same result.
Thanks
Working for me:
https://docs.erpnext.com/docs/user/manual/en
Have you tested this on different networks as well? Could be a network related or a temporary issue.
Yes i tried your link on my laptop and it works , let me kill all connections , reboot and try again.
Thanks Brother 
Hi Kenneth
All good , manual docs accessible.
Thank You
Salim