added Important Notes (#1974)

Author: soyeric128

docs/en/sql-reference/10-sql-commands/10-dml/dml-insert-multi.md

@@ -57,6 +57,10 @@ SELECT ...
 | WHEN                                     | Conditional statement to determine when to insert data into specific target tables.<br/>- A conditional multi-table insert requires at least one WHEN clause.<br/>- A WHEN clause can include multiple INTO clauses, and these INTO clauses can target the same table.<br/>- To unconditionally execute a WHEN clause, you can use `WHEN 1 THEN ...`. |
 | ELSE                                     | Specifies the action to take if none of the conditions specified in the WHEN clauses are met.                                                                                                                                                                                                                                                         |
 
+## Important Notes
+
+- Aggregate functions, external UDFs, and window functions are not allowed in the `VALUES(...)` expressions.
+
 ## Examples
 
 ### Example-1: Unconditional INSERT ALL

docs/en/sql-reference/10-sql-commands/10-dml/dml-insert.md

@@ -30,6 +30,10 @@ INSERT { OVERWRITE | INTO } <table>
 | OVERWRITE | Indicates whether existing data should be truncated before insertion.            |
 | VALUES    | Allows direct insertion of specific values or the default values of the columns. |
 
+## Important Notes
+
+- Aggregate functions, external UDFs, and window functions are not allowed in the `VALUES(...)` expressions.
+
 ## Examples
 
 ### Example-1: Insert Values with OVERWRITE