Add missing doc index (#9462)

docs/source/user-guide/sql/scalar_functions.md

@@ -1949,8 +1949,13 @@ from_unixtime(expression)
 - [array_concat](#array_concat)
 - [array_contains](#array_contains)
 - [array_dims](#array_dims)
+- [array_has](#array_has)
+- [array_has_all](#array_has_all)
+- [array_has_any](#array_has_any)]
 - [array_element](#array_element)
+- [array_except](#array_except)
 - [array_extract](#array_extract)
+- [array_fill](#array_fill)
 - [array_indexof](#array_indexof)
 - [array_join](#array_join)
 - [array_length](#array_length)
@@ -1972,6 +1977,7 @@ from_unixtime(expression)
 - [array_reverse](#array_reverse)
 - [array_slice](#array_slice)
 - [array_to_string](#array_to_string)
+- [array_union](#array_union)
 - [cardinality](#cardinality)
 - [empty](#empty)
 - [flatten](#flatten)