bpf: Clear up confusion in bpf_skb_adjust_room()'s documentation
Adding or removing room space _below_ layers 2 or 3, as the description mentions, is ambiguous. This was written with a mental image of the packet with layer 2 at the top, layer 3 under it, and so on. But it has led users to believe that it was on lower layers (before the beginning of the L2 and L3 headers respectively). Let's make it more explicit, and specify between which layers the room space is adjusted. Reported-by: NRumen Telbizov <rumen.telbizov@menlosecurity.com> Signed-off-by: NQuentin Monnet <quentin@isovalent.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20220812153727.224500-3-quentin@isovalent.com
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