net: fix comment in IPv6 header
net: fix comment in IPv6 header

The comment got it wrong. The payload length field
does not include the fixed IPv6 header size.

Fixes: 7eca7f7fd09d ("net: add missing endianness annotations")
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org

Signed-off-by: Ivan Malov <436a2feb05eb79a6862681e66bd0193220e8fb2d@oktetlabs.ru>
Reviewed-by: Andrew Rybchenko <4155e7bf8e0185127625dac6d84336299844982f@oktetlabs.ru>
Reviewed-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk