fix code

hutool-cron/src/main/java/cn/hutool/cron/task/RunnableTask.java

@@ -2,12 +2,17 @@ package cn.hutool.cron.task;
 
 /**
  * {@link Runnable} 的 {@link Task}包装
- * @author Looly
  *
+ * @author Looly
  */
-public class RunnableTask implements Task{
+public class RunnableTask implements Task {
 	private final Runnable runnable;
 
+	/**
+	 * 构造
+	 *
+	 * @param runnable {@link Runnable}
+	 */
 	public RunnableTask(final Runnable runnable) {
 		this.runnable = runnable;
 	}