"Run-node" instructions should use unique page and section names

Giving the same **Advanced Configuration** name to a) **2.1 Upgrade Guide** _section_ and b) **Advanced Configuration** _page_ looks confusing.
I suggest that we have unique page and (sub-) section names for easy navigation and reference.

<img width="1033" height="1066" alt="Image" src="https://github.com/user-attachments/assets/8879f3fc-a265-42be-b214-4a9b4a70661a" />