adding comment

src/Umbraco.Web.UI.Client/src/packages/core/content-type/content-type-container-structure-helper.class.ts

@@ -17,6 +17,7 @@ export class UmbContentTypeContainerStructureHelper<T extends UmbContentTypeMode
 	private _ownerType?: PropertyContainerTypes = 'Tab';
 	private _childType?: PropertyContainerTypes = 'Group';
 	private _isRoot = false;
+	// The owner id is the owning container (The container that is begin presented, the container the is the parent of the child containers)
 	private _ownerId?: string | null;
 	private _ownerName?: string;