chore: fix model guarded property docblocks

Author: ManukMinasyan

src/Models/CustomField.php

@@ -65,7 +65,7 @@ class CustomField extends Model
     use HasFieldType;
 
     /**
-     * @var array<string>|bool
+     * @var array<string>
      */
     protected $guarded = [];
 

src/Models/CustomFieldSection.php

@@ -47,7 +47,7 @@ class CustomFieldSection extends Model
     use HasFactory;
 
     /**
-     * @var array<string>|bool
+     * @var array<string>
      */
     protected $guarded = [];