chore(*): fixing api docs for new events

Author: ChronosSF

projects/igniteui-angular/src/lib/grids/grid-base.directive.ts

@@ -1065,7 +1065,7 @@ export abstract class IgxGridBaseDirective extends DisplayDensityBase implements
      * 
      * @example
      * ```typescript
-     *  <igx-grid #grid [data]="localData" [autoGenerate]="true" (dataPreLoad)='handleDataPreloadEvent()'></igx-grid>
+     *  <igx-grid #grid [data]="localData" [autoGenerate]="true" (dataChanging)='handleDataChangingEvent()'></igx-grid>
      * ```
      */
      @Output()
@@ -1076,7 +1076,7 @@ export abstract class IgxGridBaseDirective extends DisplayDensityBase implements
      * 
      * @example
      * ```typescript
-     *  <igx-grid #grid [data]="localData" [autoGenerate]="true" (dataPreLoad)='handleDataPreloadEvent()'></igx-grid>
+     *  <igx-grid #grid [data]="localData" [autoGenerate]="true" (dataChanged)='handleDataChangedEvent()'></igx-grid>
      * ```
      */
     @Output()