ethernet/sun: fix repeated words in comments

Delete the redundant word 'the'.
Delete the redundant word 'is'.
Delete the redundant word 'start'.
Delete the redundant word 'checking'.

Signed-off-by: Jilin Yuan <yuanjilin@cdjrlc.com>
Link: https://lore.kernel.org/r/20220630130916.21074-1-yuanjilin@cdjrlc.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>