Modernize ebpf description #726

Job	Run time
Build ebpf_exporter in Docker (x86_64, built-in libbpf)	1m 20s
Build ebpf_exporter (x86_64, statically linked, built-in libbpf)	1m 1s
Build ebpf_exporter (x86_64, dynamically linked, built-in libbpf)	48s
Build ebpf_exporter in Docker (aarch64, emulated, built-in libbpf)	11m 28s
Build libbpf in Docker (aarch64, emulated)	3m 20s
Build examples (x86_64, built-in libbpf)	28s
Build libbpf in Docker (x86_64)	36s
Build tracing demos (x86_64)	1m 8s
Run clang-format check	9s
Run jsonschema checks	13s
Lint ebpf_exporter (x86_64, built-in libbpf)	44s
Publish Docker images (x86_64, aarch64)	12m 14s
Test ebpf_exporter (x86_64, built-in libbpf)	55s
Build ebpf_exporter (x86_64, dynamically linked, system libbpf)	38s
Build examples (x86_64, system libbpf)	27s
Test ebpf_exporter (x86_64, system libbpf)	1m 0s
Build ebpf_exporter (x86_64, statically linked, system libbpf)	42s
Check examples	19s
	37m 30s

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