How to update READMEs

The README doc in our own version of Gitlab is referencing gitlab.com everywhere instead of gitlab.something.net . I think it’s just because that page was cloned from gitlab.com. But that can be very confusing and misleading for a new engineer. How can we update our own version of the README docs?
For example, in a page like this: https://gitlab.something.net/help/ssh/README#generating-a-new-ssh-key-pair