docs: Rename HugePages how-to and add steps to enable HugePages in host

[dariofaccin]

Description

This PR refactors the how-to guide for deploying UPF with HugePages, keeping the guide name consistent and adding a section on how-to enable and configure HugePages in the host.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that validate the behaviour of the software
• [x] I validated that new and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [ ] I have bumped the version of the library