[FLINK-37199][doc] Update configuration in quickstart.

docs/content.zh/docs/get-started/quickstart/mysql-to-doris.md

@@ -40,10 +40,12 @@ under the License.
    cd flink-1.19.1
    ```
 
-2. 通过在 conf/flink-conf.yaml 配置文件追加下列参数开启 checkpoint，每隔 3 秒做一次 checkpoint。
+2. 通过在 conf/config.yaml 配置文件追加下列参数开启 checkpoint，每隔 3 秒做一次 checkpoint。
 
    ```yaml
-   execution.checkpointing.interval: 3000
+   execution:
+     checkpointing:
+       interval: 3s
    ```
 
 3. 使用下面的命令启动 Flink 集群。

docs/content.zh/docs/get-started/quickstart/mysql-to-starrocks.md

@@ -40,10 +40,12 @@ under the License.
    cd flink-1.19.1
    ```
 
-2. 通过在 conf/flink-conf.yaml 配置文件追加下列参数开启 checkpoint，每隔 3 秒做一次 checkpoint。
+2. 通过在 conf/config.yaml 配置文件追加下列参数开启 checkpoint，每隔 3 秒做一次 checkpoint。
 
    ```yaml
-   execution.checkpointing.interval: 3000
+   execution:
+     checkpointing:
+       interval: 3s
    ```
 
 3. 使用下面的命令启动 Flink 集群。

docs/content/docs/get-started/quickstart/mysql-to-doris.md

@@ -42,10 +42,12 @@ Prepare a Linux or MacOS computer with Docker installed.
    cd flink-1.19.1
    ```
 
-2. Enable checkpointing by appending the following parameters to the conf/flink-conf.yaml configuration file to perform a checkpoint every 3 seconds.
+2. Enable checkpointing by appending the following parameters to the conf/config.yaml configuration file to perform a checkpoint every 3 seconds.
 
    ```yaml
-   execution.checkpointing.interval: 3000
+   execution:
+     checkpointing:
+       interval: 3s
    ```
 
 3. Start the Flink cluster using the following command.

docs/content/docs/get-started/quickstart/mysql-to-starrocks.md

@@ -42,10 +42,12 @@ Prepare a Linux or MacOS computer with Docker installed.
    cd flink-1.19.1
    ```
 
-2. Enable checkpointing by appending the following parameters to the conf/flink-conf.yaml configuration file to perform a checkpoint every 3 seconds.
+2. Enable checkpointing by appending the following parameters to the conf/config.yaml configuration file to perform a checkpoint every 3 seconds.
 
    ```yaml
-   execution.checkpointing.interval: 3000
+   execution:
+     checkpointing:
+       interval: 3s
    ```
 
 3. Start the Flink cluster using the following command.