bpf, docs: Linux byteswap note

Add Linux byteswap note.

Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Link: https://lore.kernel.org/r/20220927185958.14995-2-dthaler1968@googlemail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Documentation/bpf/instruction-set.rst

@@ -156,10 +156,6 @@ Examples:
 
   dst_reg = htobe64(dst_reg)
 
-``BPF_FROM_LE`` and ``BPF_FROM_BE`` exist as aliases for ``BPF_TO_LE`` and
-``BPF_TO_BE`` respectively.
-
-
 Jump instructions
 -----------------
 

Documentation/bpf/linux-notes.rst

@@ -7,6 +7,11 @@ Linux implementation notes
 
 This document provides more details specific to the Linux kernel implementation of the eBPF instruction set.
 
+Byte swap instructions
+======================
+
+``BPF_FROM_LE`` and ``BPF_FROM_BE`` exist as aliases for ``BPF_TO_LE`` and ``BPF_TO_BE`` respectively.
+
 Legacy BPF Packet access instructions
 =====================================