some problems of docs

docs/en/12-taos-sql/05-insert.md

@@ -108,11 +108,11 @@ INSERT INTO d21001 USING meters TAGS ('California.SanFrancisco', 2) VALUES ('202
 
 ## Insert Rows From A File
 
-Besides using `VALUES` to insert one or multiple rows, the data to be inserted can also be prepared in a CSV file with comma as separator and each field value quoted by single quotes. Table definition is not required in the CSV file. For example, if file "/tmp/csvfile.csv" contains the below data:
+Besides using `VALUES` to insert one or multiple rows, the data to be inserted can also be prepared in a CSV file with comma as separator and timestamp and string field value quoted by single quotes. Table definition is not required in the CSV file. For example, if file "/tmp/csvfile.csv" contains the below data:
 
 ```
-'2021-07-13 14:07:34.630', '10.2', '219', '0.32'
-'2021-07-13 14:07:35.779', '10.15', '217', '0.33'
+'2021-07-13 14:07:34.630', 10.2, 219, 0.32
+'2021-07-13 14:07:35.779', 10.15, 217, 0.33
 ```
 
 Then data in this file can be inserted by the SQL statement below:

docs/en/12-taos-sql/21-node.md

@@ -64,6 +64,12 @@ dnode_option: {
 
 The parameters that you can modify through this statement are the same as those located in the dnode configuration file. Modifications that you make through this statement take effect immediately, while modifications to the configuration file take effect when the dnode restarts.
 
+`value` is the value of the parameter, which needs to be in character format. For example, modify the log output level of dnode 1 to debug:
+
+```sql
+ALTER DNODE 1 'debugFlag' '143';
+```
+
 ## Add an Mnode
 
 ```sql

docs/zh/12-taos-sql/05-insert.md

@@ -109,11 +109,11 @@ INSERT INTO d21001 USING meters TAGS ('California.SanFrancisco', 2) VALUES ('202
 
 ## 插入来自文件的数据记录
 
-除了使用 VALUES 关键字插入一行或多行数据外，也可以把要写入的数据放在 CSV 文件中（英文逗号分隔、英文单引号括住每个值）供 SQL 指令读取。其中 CSV 文件无需表头。例如，如果 /tmp/csvfile.csv 文件的内容为：
+除了使用 VALUES 关键字插入一行或多行数据外，也可以把要写入的数据放在 CSV 文件中（英文逗号分隔、时间戳和字符串类型的值需要用英文单引号括住）供 SQL 指令读取。其中 CSV 文件无需表头。例如，如果 /tmp/csvfile.csv 文件的内容为：
 
 ```
-'2021-07-13 14:07:34.630', '10.2', '219', '0.32'
-'2021-07-13 14:07:35.779', '10.15', '217', '0.33'
+'2021-07-13 14:07:34.630', 10.2, 219, 0.32
+'2021-07-13 14:07:35.779', 10.15, 217, 0.33
 ```
 
 那么通过如下指令可以把这个文件中的数据写入子表中：

docs/zh/12-taos-sql/21-node.md

@@ -65,6 +65,12 @@ dnode_option: {
 
 上面语法中的这些可修改配置项其配置方式与 dnode 配置文件中的配置方式相同，区别是修改是动态的立即生效，且不需要重启 dnode。
 
+value 是参数的值，需要是字符格式。如修改 dnode 1 的日志输出级别为 debug：
+
+```sql
+ALTER DNODE 1 'debugFlag' '143';
+```
+
 ## 添加管理节点
 
 ```sql