Modify DiscardServer of example to be consistent with the implementation in user guide #13953
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Motivation:
Implemention of DiscardServer are inconsistent between user-guide and example module
#13952
https://netty.io/wiki/developer-guide.html
Modification:
the code in user-guide is very clear, so I modify some code of example module
Result:
modify the implemention of DiscardServer