[fix](docs) add enable_single_replica_load on be config doc (#22948)

docs/en/docs/admin-manual/config/be-config.md

@@ -712,6 +712,11 @@ BaseCompaction:546859:
 * Description: Import the number of threads for processing NORMAL priority tasks
 * Default value: 3
 
+#### `enable_single_replica_load`
+
+* Description: Whether to enable the single-copy data import function
+* Default value: false
+
 #### `load_error_log_reserve_hours`
 
 * Description: The load error log will be deleted after this time

docs/en/docs/faq/sql-faq.md

@@ -94,3 +94,8 @@ If the `curl 77: Problem with the SSL CA cert` error appears in the be.INFO log.
 1. Download the certificate at [https://curl.se/docs/caextract.html](https://curl.se/docs/caextract.html): cacert.pem
 2. Copy the certificate to the specified location: `sudo cp /tmp/cacert.pem /etc/ssl/certs/ca-certificates.crt`
 3. Restart the BE node.
+
+### Q7. import error："Message": "[INTERNAL_ERROR]single replica load is disabled on BE."
+
+1. Add parameters in be.conf : enable_single_replica_load = true
+2.  Restart the BE node.

docs/zh-CN/docs/admin-manual/config/be-config.md

@@ -738,6 +738,11 @@ BaseCompaction:546859:
 * 描述: 导入线程数，用于处理NORMAL优先级任务
 * 默认值: 3
 
+#### `enable_single_replica_load`
+
+* 描述: 是否启动单副本数据导入功能
+* 默认值: false
+
 #### `load_error_log_reserve_hours`
 
 * 描述: load错误日志将在此时间后删除

docs/zh-CN/docs/faq/sql-faq.md

@@ -84,3 +84,8 @@ Doris的 Master FE 节点会主动发送心跳给各个FE或BE节点，并且在
 1. 在 [https://curl.se/docs/caextract.html](https://curl.se/docs/caextract.html) 下载证书：cacert.pem
 2. 拷贝证书到指定位置：`sudo cp /tmp/cacert.pem /etc/ssl/certs/ca-certificates.crt`
 3. 重启 BE 节点。
+
+### Q7. 导入报错："Message": "[INTERNAL_ERROR]single replica load is disabled on BE."
+
+1. be.conf中增加 enable_single_replica_load = true
+2. 重启 BE 节点。