improve raise error within widget docs

CHANGELOG.md

@@ -30,6 +30,7 @@ should change the heading of the (upcoming) version to include a major version b
 
 - Updated docs for ArrayFieldItemTemplate to include prop `onCopyIndexClick`, fixing [#4507](https://github.com/rjsf-team/react-jsonschema-form/issues/4507)
 - Use antd 5 in playground
+- Updated docs to clarify that errors raised within a widget are not caught during form validation
 
 # 5.24.8
 

packages/docs/docs/advanced-customization/custom-widgets-fields.md

@@ -94,7 +94,15 @@ The default widgets you can override are:
 
 ## Raising errors from within a custom widget or field
 
-You can raise a custom error by overriding the `onChange` method to raise field/widget errors:
+You can raise custom 'live validation' errors by overriding the `onChange` method to provide feedback while users are actively changing the form data.
+Note that these errors are temporary and are not recognized during the form validation process.
+
+:::warning
+
+This method of raising errors _only_ runs during `onChange`, i.e. when the user is changing data. This will not catch errors `onSubmit`, i.e when submitting the form.
+If you wish to add generic validation logic for your component, you should use the [`customValidate` Form prop](../api-reference/form-props.md#customvalidate).
+
+:::
 
 ```tsx
 import { ErrorSchema, RJSFSchema, UiSchema, WidgetProps, RegistryWidgetsType } from '@rjsf/utils';