ethernet/neterion: fix repeated words in comments

Delete the redundant word 'the'.
Delete the redundant word 'a'.
Delete the redundant word 'frame'.
Delete the redundant word 'is'.
Delete the redundant word 'not'.

Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>