Merge pull request #3741 from JimmyLv/patch-1

Update practical-projects.zh-CN.md

docs/react/practical-projects.zh-CN.md

@@ -131,7 +131,7 @@ const ProductList = ({ onDelete, products }) => {
   );
 };
 
-ProductList.proptypes = {
+ProductList.propTypes = {
   onDelete: PropTypes.func.isRequired,
   products: PropTypes.array.isRequired,
 };