The ethdev port id should be 16 bits now. This patch changes the
variable size of port id in docs from 8 bits to 16 bits.
Fixes: fdec9301f52d ("doc: add flow classify guides")
Fixes: 4a3ef59a10c8 ("examples/flow_filtering: add simple demo of flow API")
Cc: stable@dpdk.org
Signed-off-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>