docs: add missing cross-links

docs/reference/src/components/cairo/modules/language_constructs/pages/array-types.adoc

@@ -26,6 +26,9 @@ You can also initialize with literal values using the `array![]` macro:
 let arr = array![1, 2, 3, 4]; // Implicitly Array<felt252>
 ----
 
+For fixed-size array literals such as `[1, 2, 3]` and repeat syntax such as `[0; 4]`, see
+xref:array-expressions.adoc[Array expressions].
+
 == Common Operations
 
 - **Append** — adds an element to the end:

docs/reference/src/components/cairo/modules/language_constructs/pages/enums.adoc

@@ -1,6 +1,7 @@
 = Enums
 
-An enum is a type that can hold one of the types from the list of its defined variants.
+An enum is a user-defined type that can hold one of the types from the list of its
+defined variants.
 Each variant has its own type, and when such an enum variable holds a variant,
 it contains a value of the type of the variant.
 It is one of the ways to define custom user types.

docs/reference/src/components/cairo/modules/language_constructs/pages/path.adoc

@@ -58,6 +58,9 @@ Concrete paths are used in:
 foo::bar::<bool>() // Function call expression
 Option::<bool>::Some(true) // Enum variant expression
 ----
++
+For standalone uses of concrete paths as expressions, see
+xref:path-expressions.adoc[Path expressions].
 
 * Type expressions
 - `let x: Option<bool> = None;` // Let statement type clause

docs/reference/src/components/cairo/modules/language_constructs/pages/structs.adoc

@@ -45,7 +45,8 @@ struct ListNode {
 
 == Usage
 
-A struct is instantiated with the `StructName { member1: value1, member2: value2, ... }` syntax.
+A struct is instantiated with the xref:struct-expressions.adoc[struct expression] syntax
+`StructName { member1: value1, member2: value2, ... }`.
 For example:
 
 [source,cairo]
@@ -86,6 +87,7 @@ in the deconstruction. See xref:patterns.adoc[patterns] for more information.
 === The Dot (`.`) operator:
 
 Another way to access struct members is with the dot (`.`) operator.
+See xref:member-access-expressions.adoc[Member access expressions] for more details.
 
 [source,cairo]
 ----