Corrected wrong comment in Net.class

[科幻片]

Hi, All!


I found a incorrect comment on the unblock4() method, so I modify the comment on the unblock4() method, because the original comment will cause people to misunderstand. the PR address is：
https://github.com/openjdk/jdk/pull/15186



looking forward to your feedback！



cheers,
shiker1996
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