examples/pipeline: fix help command
examples/pipeline: fix help command

This patch has the changes to list all supported commands and fix
supported commands help details.

Fixes: 5074e1d55107 ("examples/pipeline: add configuration commands")

Signed-off-by: Yogesh Jangra <b52692a938227384b0d0db7546f9c4ec4f92b1b2@intel.com>
Acked-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

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