docs(grid): clarify closing and opening cells behavior

Author: marin-bratanov

components/grid/editing/incell.md

@@ -189,6 +189,8 @@ Click a cell, edit it and click outside of the cell to see the change.
 
 * The `OnCancel` event and the `Cancel` command button are not supported in InCell editing mode. Clicking outside the currently edited cell will trigger the `OnUpdate` event and thus, clicking on the `Cancel` command button will not fire the `OnCancel` event.
 
+    * If there is a cell that is being edited at the moment, clicking on another cell will first close the current cell and fire `OnUpdate`. To start editing the new cell in such a case you will need a second click.
+
 * When using an [editor template]({%slug components/grid/features/templates%}#edit-template), the grid cannot always know what the custom editor needs to do, and when it needs to close the cell and update the data, because this is up to the editor. Thus, you can use the grid [state]({%slug grid-state%}) to close the cell and invoke the desired operations on the data according to your business logic. For example, a suitable event the Telerik input components provide is `OnChange`.
     * When keyboard navigation is enabled in the grid (`Navigable=true`), the grid will capture `Enter` keypresses when the cell is focused, and will close the cell with the corresponding update. You can either use that (e.g., a simple input will let the keypress event propagate to the grid cell), or you can prevent the event propagation and use only your business logic.