docs: add insert select description

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

@@ -17,7 +17,7 @@ INSERT INTO
         VALUES (field1_value, ...) [(field1_value2, ...) ...] | FILE csv_file_path
     ...];
 
-INSERT INTO tb_name [(field1_name, ...)] query
+INSERT INTO tb_name [(field1_name, ...)] subquery
 ```
 
 **Timestamps**
@@ -39,7 +39,7 @@ INSERT INTO tb_name [(field1_name, ...)] query
 
 4. The FILE clause inserts tags or data from a comma-separates values (CSV) file. Do not include headers in your CSV files.
 
-5. A single INSERT ... VALUES statement or INSERT ... FILE statement can write data to multiple tables.
+5. A single `INSERT ... VALUES` statement and `INSERT ... FILE` statement can write data to multiple tables.
 
 6. The INSERT statement is fully parsed before being executed, so that if any element of the statement fails, the entire statement will fail. For example, the following statement will not create a table because the latter part of the statement is invalid:
 
@@ -49,7 +49,7 @@ INSERT INTO tb_name [(field1_name, ...)] query
 
 7. However, an INSERT statement that writes data to multiple subtables can succeed for some tables and fail for others. This situation is caused because vnodes perform write operations independently of each other. One vnode failing to write data does not affect the ability of other vnodes to write successfully.
 
-8. Data from TDengine can be inserted into a specified table using the INSERT ... query statement. Arbitrary query statements are supported. This syntax can only be used for subtables and normal tables, and does not support automatic table creation.
+8. Data from TDengine can be inserted into a specified table using the `INSERT ... subquery` statement. Arbitrary query statements are supported. This syntax can only be used for subtables and normal tables, and does not support automatic table creation.
 
 ## Insert a Record
 

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

@@ -18,7 +18,7 @@ INSERT INTO
         VALUES (field1_value, ...) [(field1_value2, ...) ...] | FILE csv_file_path
     ...];
 
-INSERT INTO tb_name [(field1_name, ...)] query
+INSERT INTO tb_name [(field1_name, ...)] subquery
 ```
 
 **关于时间戳**
@@ -40,7 +40,7 @@ INSERT INTO tb_name [(field1_name, ...)] query
 
 4. FILE 语法表示数据来自于 CSV 文件（英文逗号分隔、英文单引号括住每个值），CSV 文件无需表头。
 
-5. INSERT ... VALUES 语句和 INSERT ... FILE 语句均可以在一条 INSERT 语句中同时向多个表插入数据。
+5. `INSERT ... VALUES` 语句和 `INSERT ... FILE` 语句均可以在一条 INSERT 语句中同时向多个表插入数据。
 
 6. INSERT 语句是完整解析后再执行的，对如下语句，不会再出现数据错误但建表成功的情况：
 
@@ -50,7 +50,7 @@ INSERT INTO tb_name [(field1_name, ...)] query
 
 7. 对于向多个子表插入数据的情况，依然会有部分数据写入失败，部分数据写入成功的情况。这是因为多个子表可能分布在不同的 VNODE 上，客户端将 INSERT 语句完整解析后，将数据发往各个涉及的 VNODE 上，每个 VNODE 独立进行写入操作。如果某个 VNODE 因为某些原因（比如网络问题或磁盘故障）导致写入失败，并不会影响其他 VNODE 节点的写入。
 
-8. 可以使用 INSERT ... query 语句将 TDengine 中的数据插入到指定表中。query 可以是任意的查询语句。此语法只能用于子表和普通表，且不支持自动建表。
+8. 可以使用 `INSERT ... subquery` 语句将 TDengine 中的数据插入到指定表中。subquery 可以是任意的查询语句。此语法只能用于子表和普通表，且不支持自动建表。
 
 ## 插入一条记录