去除无效引用,添加注释

src/main/java/cn/iocoder/dashboard/common/annotation/BizTracingAop.java

@@ -6,11 +6,13 @@ import org.apache.skywalking.apm.toolkit.trace.ActiveSpan;
 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.Around;
 import org.aspectj.lang.annotation.Aspect;
-import org.aspectj.lang.annotation.Before;
-import org.aspectj.lang.annotation.Pointcut;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.web.bind.annotation.ResponseBody;
 
+/**
+ * 业务链路AOP切面
+ *
+ * @author mashu
+ */
 @Aspect
 @Slf4j
 @Configuration