dpdk: add reference to the pipeline user guide (#2846)
dpdk: add reference to the pipeline user guide (#2846)

Signed-off-by: Radostin Stoyanov <af191057dab5b67c1c1061d181b58b884c4ed7f3@fedoraproject.org>
p4lang/p4c,p4lang/p4c,p4lang/p4c,p4lang/p4c,p4lang/p4c