bpf, doc: Add heading and example for extensions in cbpf
Add new heading for extensions to make it more readable. Also, add one more example of filtering interface index for better understanding. Signed-off-by: Roy, UjjaL <royujjal@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/CAADnVQJ=DoRDcVkaXmY3EmNdLoO7gq1mkJOn5G=00wKH8qUtZQ@mail.gmail.com
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