drivers/net: fix vector Rx comments

drivers/net: fix vector Rx comments

For the loop to process packets in Rx vector path, some notes for the
code are wrong, fix these errors.

Fixes: 7092be8437bd ("fm10k: add vector Rx")
Fixes: c3def6a8724c ("net/i40e: implement vector PMD for altivec")
Fixes: ae0eb310f253 ("net/i40e: implement vector PMD for ARM")
Fixes: 9ed94e5bb04e ("i40e: add vector Rx")
Fixes: 319c421f3890 ("net/avf: enable SSE Rx Tx")
Fixes: 1162f5a0ef31 ("net/iavf: support flexible Rx descriptor in SSE path")
Fixes: c68a52b8b38c ("net/ice: support vector SSE in Rx")
Fixes: cf4b4708a88a ("ixgbe: improve slow-path perf with vector scattered Rx")
Cc: stable@dpdk.org
Suggested-by: Ruifeng Wang <ruifeng.wang@arm.com>
Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>