move two notes to behavior changes

releases/release-8.0.0.md

@@ -306,12 +306,12 @@ Quick access: [Quick start](https://docs.pingcap.com/tidb/v8.0/quick-start-with-
 >
 > This section provides compatibility changes you need to know when you upgrade from v7.6.0 to the current version (v8.0.0). If you are upgrading from v7.5.0 or earlier versions to the current version, you might also need to check the compatibility changes introduced in intermediate versions.
 
-- Prohibit setting [`require_secure_transport`](/system-variables.md#require_secure_transport-new-in-v610) to `ON` in Security Enhanced Mode (SEM) to prevent potential connectivity issues for users. [#47665](https://github.com/pingcap/tidb/issues/47665) @[tiancaiamao](https://github.com/tiancaiamao)
-- DM removes the fixed secret key for encryption and decryption and enables you to customize a secret key for encryption and decryption. If encrypted passwords are used in [data source configurations](/dm/dm-source-configuration-file.md) and [migration task configurations](/dm/task-configuration-file-full.md) before the upgrade, you need to refer to the upgrade steps in [Customize a Secret Key for DM Encryption and Decryption](/dm/dm-customized-secret-key.md) for additional operations. [#9492](https://github.com/pingcap/tiflow/issues/9492) @[D3Hunter](https://github.com/D3Hunter)
 - Remove witness-related schedulers that are not GA but are enabled by default [#7765](https://github.com/tikv/pd/pull/7765) @[rleungx](https://github.com/rleungx)
 
 ### Behavior changes
 
+* Prohibit setting [`require_secure_transport`](/system-variables.md#require_secure_transport-new-in-v610) to `ON` in Security Enhanced Mode (SEM) to prevent potential connectivity issues for users. [#47665](https://github.com/pingcap/tidb/issues/47665) @[tiancaiamao](https://github.com/tiancaiamao)
+* DM removes the fixed secret key for encryption and decryption and enables you to customize a secret key for encryption and decryption. If encrypted passwords are used in [data source configurations](/dm/dm-source-configuration-file.md) and [migration task configurations](/dm/task-configuration-file-full.md) before the upgrade, you need to refer to the upgrade steps in [Customize a Secret Key for DM Encryption and Decryption](/dm/dm-customized-secret-key.md) for additional operations. [#9492](https://github.com/pingcap/tiflow/issues/9492) @[D3Hunter](https://github.com/D3Hunter)
 * Before v8.0.0, after enabling the acceleration of `ADD INDEX` and `CREATE INDEX` (`tidb_ddl_enable_fast_reorg = ON`), the encoded index key ingests data to TiKV with a fixed concurrency of `16`, which cannot be dynamically adjusted according to the downstream TiKV capacity. Starting from v8.0.0, you can adjust the concurrency using the [`tidb_ddl_reorg_worker_cnt`](/system-variables.md#tidb_ddl_reorg_worker_cnt) system variable. The default value is `4`. Compared with the previous default value of `16`, the new default value reduces performance when ingesting indexed key-value pairs. You can adjust this system variable based on the workload of your cluster.
 
 ### MySQL compatibility