Update Row-Selection.md

Author: anton-gustafsson

docs/grid-functionalities/Row-Selection.md

@@ -174,7 +174,7 @@ handleOnSelectedRowsChanged(args) {
           [columnDefinitions]="columnDefinitions"
           [gridOptions]="gridOptions"
           [dataset]="dataset"
-          (onGridStateServiceChanged)="handleOngridStateChanged($event.detail.args)">
+          (onGridStateChanged)="handleOngridStateChanged($event.detail.args)">
 </angular-slickgrid>
 ```
 ```ts
@@ -244,4 +244,4 @@ addNewColumn() {
   // you could also use SlickGrid setColumns() method
   // this.angularGrid.slickGrid.setColumns(cols);
 }
-```
+```