net/sun: Fix multiple typos in comments

There are some typos in comments and while they are harmless and not visible,
there is no reason not to fix them. Fix the ones that are not register related,
which might have intentional naming convention.

Signed-off-by: Jakub Raczynski <j.raczynski@samsung.com>
Link: https://patch.msgid.link/20260601163727.554364-1-j.raczynski@samsung.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>