docs: Announce programmatic OnRead call in 3.1

Author: Dimo Dimov

upgrade/breaking-changes/3-0-0.md

@@ -24,6 +24,7 @@ Note the following changes when using manual data operations:
 - Aggregates over all the data are now supported via `args.AggregateResults` (`IEnumerable<AggregateResult>`). The `AggregateResults` event argument is exposed only for components that support aggregates. [If the Grid is bound to `DataTable`, a workaround is still necessary]({%slug grid-kb-aggregates-and-datatable%}).
 - If you have cached the `DataSourceRequest` object in order to set `Data` later, the new approach is to [reset the Grid state, so that `OnRead` is called again]({%slug grid-refresh-data%}#call-onread).
 - Binding to `ObservableData` via `OnRead` is no longer supported.
+- [UI for Blazor 3.1](https://www.telerik.com/support/whats-new/blazor-ui/roadmap) will add a method that triggers `OnRead` programmatically for on-demand data updates.
 
 >caption OnRead Usage in UI for Blazor up to version 2.30 and after version 3.0