Out of sync data plane notification

## Definition of done
Update the [data plane reference ](https://developer.konghq.com/gateway-manager/data-plane-reference/) to express the new method of dealing with out of sync data planes.

## Information
https://docs.google.com/document/d/1ngRA59u6lxrLP36kXxPLAktoj-HeonEAlgdvSApal_U/edit?tab=t.0

## Due date (optional)

Check with Ed

## Size

- M (Medium) Example: writing a UI how to for a straightforward product, adding a plugin example

Start by locating the source for the linked data plane reference page and read the Google Docs information provided in the issue. Update the reference to describe the new method for handling out-of-sync data planes, then verify that the published documentation reflects the requested guidance.

Written by the indexing model from the issue text.