ethdev: fix doc of flow action

[ upstream commit 56912dd ]

The struct rte_flow_action was missing from DPDK API documentation.

Fixes: 3850cf0 ("ethdev: add tunnel encap/decap actions")

Signed-off-by: Jan Viktorin <viktorin@cesnet.cz>
Acked-by: Ori Kam <orika@nvidia.com>
Acked-by: Aman Deep Singh <aman.deep.singh@intel.com>

lib/librte_ethdev/rte_flow.h

@@ -2558,7 +2558,7 @@ rte_flow_dynf_metadata_set(struct rte_mbuf *m, uint32_t v)
 	*RTE_FLOW_DYNF_METADATA(m) = v;
 }
 
-/*
+/**
  * Definition of a single action.
  *
  * A list of actions is terminated by a END action.