[Docs] Linux Service Edit (#9633)

[Docs] Linux Service Edit (#9633)

* Rename h3 title

* Add intro

Should work on Ubuntu Xenial, but should work on any Linux distros.

* Indirect edit files

Instead of providing `sudo vim`, invite to edit files.

* enable now instead of enable and start

* Re-add systemctl enable && systemctl start

* Revert service enablement back to status quo

* Add enable now counterpart for systemd > v220

* Apply suggestions from @sapk

Strip `vim` from editor usage

Co-Authored-By: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>