Code formatting

hippo4j-core/src/main/java/cn/hippo4j/core/toolkit/SystemClock.java

@@ -44,9 +44,6 @@ public class SystemClock {
         return now.get();
     }
 
-    /**
-     * 用来替换原来的System.currentTimeMillis()
-     */
     public static long now() {
         return instance().currentTimeMillis();
     }