REQ-2481: 添加删除日志表的job

im-center-server/src/main/java/cn/axzo/im/send/SendExecutor.java

@@ -53,7 +53,7 @@ public class SendExecutor<T> implements Supplier<ExecResult> {
         long execStart = System.currentTimeMillis();
         while (!sendManager.isInterrupted() && !queue().isEmpty()) {
             if (!rateLimiter.tryAcquire(1000, TimeUnit.MILLISECONDS)) {
-                //队列可能消息完了, 及早退出
+                //队列可能被消费完了, 及早退出
                 MiscUtils.sleepQuietly(100, TimeUnit.MILLISECONDS);
                 continue;
             }