updating to childNode to fix articles number (#20486)

components/landing/ProductArticlesList.tsx

@@ -53,7 +53,7 @@ const ProductTreeNodeList = ({ treeNode }: { treeNode: ProductTreeNode }) => {
               <Link href={childNode.href}>{childNode.page.title}</Link>
               {childNode.page.documentType === 'mapTopic' ? (
                 <small className="color-text-secondary d-inline-block">
-                  &nbsp;&bull; {treeNode.childPages.length} articles
+                  &nbsp;&bull; {childNode.childPages.length} articles
                 </small>
               ) : null}
             </li>