Merge branch '18.1.x' into mkirkova/fix-14086-18.1.x

Author: MonikaKirkova

projects/igniteui-angular/src/lib/grids/common/grid.interface.ts

@@ -1028,6 +1028,7 @@ export interface GridType extends IGridDataBindable {
     /** @hidden @internal */
     paginatorOutlet?: ViewContainerRef;
     flatData?: any[] | null;
+    /** @hidden @internal */
     childRow?: any;
     expansionDepth?: number;
     childDataKey?: any;

projects/igniteui-angular/src/lib/grids/hierarchical-grid/hierarchical-grid.component.ts

@@ -69,6 +69,9 @@ import { IgxActionStripToken } from '../../action-strip/token';
 
 let NEXT_ID = 0;
 
+/**
+ * @hidden @internal
+ */
 @Component({
     changeDetection: ChangeDetectionStrategy.OnPush,
     selector: 'igx-child-grid-row',
@@ -434,7 +437,7 @@ export class IgxHierarchicalGridComponent extends IgxHierarchicalGridBaseDirecti
     public parent: IgxHierarchicalGridComponent = null;
 
     /**
-     * @hidden
+     * @hidden @internal
      */
     public childRow: IgxChildGridRowComponent;