Document FEC in NIC features, add information about FEC and add
implementation related support.
Fixes: b7ccfb09da95 ("ethdev: introduce FEC API")
Fixes: 9bf2ea8dbc65 ("net/hns3: support FEC")
Fixes: 62aafe035896 ("net/cxgbe: support configuring link FEC")
Cc: stable@dpdk.org
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>