Frappe framework documentation

Hi to all,
In all video tutorial and webinar, it is always shown a documentation page with alla frappe standard function with list of parameters and function description, so a sort of developer and user documentation

https://frappe.io/github.io/

for example

I tried to reach this page but is not reachable, anyone know if is it not a public page or is moved to another address??

They no longer exist, please refer the GitHub repo or download code