Motivation:
41e03adf249ee9d23938fecf9be980a096710b36 marked ChannelHandler.exceptionCaught(...) as @deprecated but missed to also mark ChannelHandlerAdapter.exceptionCaught(...) as @deprecated. We should do so as most people extend the base classes and not implement the interfaces directly.
Modifications:
Mark ChannelHandlerAdapter.exceptionCaught(...) as @deprecated as well.
Result:
Mark method as @deprecated to warn users about its removal.
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