Remove note about TiDB < v4.0.7 (#2913) (#2925)

Author: ti-chi-bot

en/get-started.md

@@ -316,10 +316,6 @@ If port `14000` is already in use, you can use a different available port. The c
 
 ### Connect to the TiDB service
 
-> **Note:**
->
-> To connect to TiDB (version < v4.0.7) using a MySQL 8.0 client, if the user account has a password, you must explicitly specify `--default-auth=mysql_native_password`. This is because `mysql_native_password` is [no longer the default plugin](https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password).
-
 ```shell
 mysql --comments -h 127.0.0.1 -P 14000 -u root
 ```

zh/get-started.md

@@ -316,10 +316,6 @@ kubectl port-forward -n db svc/tidb-tidb 14000:4000 > pf14000.out &
 
 ### 连接 TiDB 服务
 
-> **注意：**
->
-> 当使用 MySQL Client 8.0 访问 TiDB 服务（TiDB 版本 < v4.0.7）时，如果用户账户有配置密码，必须显式指定 `--default-auth=mysql_native_password` 参数，因为 `mysql_native_password` [不再是默认的插件](https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password)。
-
 ```shell
 mysql --comments -h 127.0.0.1 -P 14000 -u root
 ```