Update DocumentationCategory.php

app/Models/DocumentationCategory.php

@@ -3,15 +3,16 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class DocumentationCategory extends Model
 {
     public $fillable = [
         'title',
-        'description'
+        'description',
     ];
 
-    public function items()
+    public function items(): HasMany
     {
         return $this->hasMany(DocumentationItem::class);
     }