docs(grid): selection change event fires when observable data changes - explicit doc

Author: marin-bratanov

components/grid/selection/overview.md

@@ -120,7 +120,7 @@ When the grid `Data` collection changes, the `SelectedItems` collection has the
 * When using an `ObservableCollection` for the grid `Data`- If an item is removed or the entire data is cleared using the collection's `.Clear()` method, it will automatically update the `SelectedItems` collection too (the removed Data items will be removed from the Selected Items collection). 
 
     * The other CRUD operations (Create and Update), you should use the grid [editing events]({%slug components/grid/editing/overview%}) to handle the situation according to your business logic and preferred behavior.
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+    * When the data changes and the selected items are cleared, the `SelectedItemsChanged` event will fire with the empty collection. If you are using two-way binding, the collection will be cleared.