'/**<' style comments apply to the previous member, which caused doxygen to
emit the RTE_RING_NAMESIZE documentation for RTE_RING_MZ_PREFIX.
Fixes: 38c9817ee1d8 ("mempool: adjust name size in related data types")
Cc: stable@dpdk.org
Signed-off-by: Gage Eads <gage.eads@intel.com>