[chore] (array-function) add alias array_append for function array_pushback

Author: zhangshixin.1024

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

@@ -15,6 +15,10 @@
 
 Adds an element to the end of an array. The function returns a new array containing all elements from the original array plus the newly added element.
 
+## Alias
+
+- array_append
+
 ## Syntax
 
 ```sql

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

@@ -15,6 +15,10 @@
 
 在数组末尾添加一个元素。函数会返回一个新数组，包含原数组的所有元素以及新添加的元素。
 
+## 别名
+
+- array_append
+
 ## 语法
 
 ```sql