Update 10-function.md

docs/en/12-taos-sql/10-function.md

@@ -1050,7 +1050,7 @@ TOP(expr, k)
 UNIQUE(expr)
 ```
 
-**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword, but it can also be used to match tags or timestamp which correspond to first occurrence of the record.
+**Description**: The values that occur the first time in the specified column. The effect is similar to `distinct` keyword.
 
 **Return value type**:Same as the data type of the column being operated upon