pay attention to use updateRepeaterMorphMany for dealing with polymor…

…phic relationships

docs/src/form-fields/repeater.md

@@ -89,6 +89,7 @@ class TeamMember extends Model
 ```
 
 - Update `TeamRepository`. Override the `afterSave` and `getFormFields` methods to process the repeater field:
+  - Note: For Polymorphic relationships, use `updateRepeaterMorphMany` in place of `updateRepeater`
 
 ```php
 class TeamRepository extends ModuleRepository