[doc](function) update json_array (#2456)

Author: mrhhsg

docs/sql-manual/sql-functions/scalar-functions/json-functions/json-array.md

@@ -5,14 +5,18 @@
 }
 ---
 
-# JSON_ARRAY
 ## Description
 Generate a JSON array containing the specified elements. Returns an empty array when no parameters are passed.
 
 ## Syntax
 ```sql
 JSON_ARRAY([<expression>, ...]) 
 ```
+## Arguments
+### Variable arguments: 
+- `<expression>`: Elements to be included in the JSON array can be of a single type or multiple types, including NULL.
+## Returns
+[`Nullable(JSON)`](../../../basic-element/sql-data-types/semi-structured/JSON.md): Returns a JSON array containing the specified values. If no values are specified, an empty JSON array is returned.
 
 ## Parameters
 ### Variable parameters:

i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/json-functions/json-array.md

@@ -5,9 +5,9 @@
 }
 ---
 
-# JSON_ARRAY
-## 功能
+## 描述
 生成一个包含指定元素的 json 数组，未传入参数时返回空数组。
+
 ## 语法
 ```sql
 JSON_ARRAY([<expression>, ...])