Apply suggestions from code review

releases/release-8.4.0.md

@@ -53,8 +53,8 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.4/quick-start-with-
     <td>Use TiProxy to capture real workloads from TiDB production clusters before major operations such as cluster upgrades, migrations, or deployment changes. Replay these workloads on target test clusters to validate performance and ensure successful changes.</td>
   </tr>
   <tr>
-    <td><a href="https://docs.pingcap.com/tidb/v8.4/system-variables#tidb_auto_analyze_concurrency-new-in-v840">Adaptive concurrency for statistics collection</a>**tw@Oreoxmt 1739**</td>
-    <td>Automatic statistics collection determines the collection concurrency based on node scale and hardware specifications. This improves statistics collection efficiency, reduces manual tuning, and ensures stable cluster performance.</td>
+    <td><a href="https://docs.pingcap.com/tidb/v8.4/system-variables#tidb_auto_analyze_concurrency-new-in-v840">Concurrent automatic statistics collection</a>**tw@Oreoxmt 1739**</td>
+    <td>You can set the concurrency within a single automatic statistics collection task using the system variable <code>tidb_auto_analyze_concurrency</code>. TiDB automatically determines the concurrency of scanning tasks based on node scale and hardware specifications. This improves statistics collection efficiency by fully utilizing system resources, reduces manual tuning, and ensures stable cluster performance.</td>
   </tr>
   <tr>
     <td rowspan="1">SQL</td>
@@ -370,7 +370,7 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.4/quick-start-with-
     - Add write control to the [`mysql.tidb_runaway_queries`](/mysql-schema/mysql-schema.md#system-tables-related-to-runaway-queries) log table to reduce overhead caused by a large number of concurrent writes [#54434](https://github.com/pingcap/tidb/issues/54434) @[HuSharp](https://github.com/HuSharp) <!--1908--> **tw@lilin90**
     - Support Index Join by default when the inner table has `Selection`, `Projection`, or `Aggregation` operators on it [#47233](https://github.com/pingcap/tidb/issues/47233) @[winoros](https://github.com/winoros) **tw@Oreoxmt** <!--1709-->
     - Reduce the number of column details fetched from TiKV for `DELETE` operations in certain scenarios, lowering the resource overhead of these operations [#38911](https://github.com/pingcap/tidb/issues/38911) @[winoros](https://github.com/winoros) **tw@Oreoxmt** <!--1798-->
-    - Improve automatic statistics collection by determining the collection concurrency based on node scale and hardware specifications [#53460](https://github.com/pingcap/tidb/issues/53460) @[hawkingrei](https://github.com/hawkingrei) **tw@Oreoxmt** <!--1739-->
+    - Support setting the concurrency within a single automatic statistics collection task using the system variable `tidb_auto_analyze_concurrency` [#53460](https://github.com/pingcap/tidb/issues/53460) @[hawkingrei](https://github.com/hawkingrei) **tw@Oreoxmt** <!--1739-->
 
 + TiKV