doc: update eBPF/compilation instructions v1

[lukashino]

Link to Redmine tickets:

• https://redmine.openinfosecfoundation.org/issues/6599
• https://redmine.openinfosecfoundation.org/issues/6686

Describe changes:

• small edit in eBPF instructions to prefer libbpf-dev package to the cloning&compilation
• porting changes from the improved version of installation instructions that got merged into master-6.0.x