typo fix repeated issue number for rocketmq 4.9.0 release's notes.
diff --git a/_posts/2021-06-08-release-notes-4.9.0.md b/_posts/2021-06-08-release-notes-4.9.0.md
index fa85019..330cd17 100644
--- a/_posts/2021-06-08-release-notes-4.9.0.md
+++ b/_posts/2021-06-08-release-notes-4.9.0.md
@@ -32,14 +32,12 @@
</li>
<li>[<a href='https://github.com/apache/rocketmq/issues/2328'>ISSUE-2328</a>] - The broker instance failed to start due to ACL parameter error.
</li>
-<li>[<a href='https://github.com/apache/rocketmq/issues/2615'>ISSUE-2615</a>] - Add property of benchmark`s producer that specifies how many messages to send.
+<li>[<a href='https://github.com/apache/rocketmq/issues/2615'>ISSUE-2615</a>] - Add property of benchmark's producer that specifies how many messages to send.
</li>
<li>[<a href='https://github.com/apache/rocketmq/issues/2683'>ISSUE-2683</a>] - Add delay message stats to brokerStatsManager.
</li>
<li>[<a href='https://github.com/apache/rocketmq/issues/2698'>ISSUE-2698</a>] - TopicRouteSubCommand enhancement.
</li>
-<li>[<a href='https://github.com/apache/rocketmq/issues/2328'>ISSUE-2328</a>] - Add parameter validation to ACL.
-</li>
<li>[<a href='https://github.com/apache/rocketmq/issues/2730'>ISSUE-2730</a>] - Fix Multiple instances in the same application share MQClientInstance.
</li>
<li>[<a href='https://github.com/apache/rocketmq/issues/2863'>ISSUE-2863</a>] - Fix the problem of potential NPE in ACL plain.
