docs:delete redundancy rows (#797)

docs/docs/user_docs/getting_started/server/hippo4j-server-start.md

@@ -69,13 +69,11 @@ spring:
 package cn.hippo4j.example;
 
 import cn.hippo4j.core.executor.DynamicThreadPool;
-import cn.hippo4j.core.executor.support.ResizableCapacityLinkedBlockIngQueue;
 import cn.hippo4j.core.executor.support.ThreadPoolBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
 import java.util.concurrent.ThreadPoolExecutor;
-import java.util.concurrent.TimeUnit;
 
 @Configuration
 public class ThreadPoolConfig {