docs(list): moving the actual documentation on the header

- The documentation on the header allow u to see on the files where the
header is inclued

list/ft_lstnew.c

@@ -6,19 +6,13 @@
 /*   By: rparodi <marvin@42.fr>                     +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2023/11/12 11:44:02 by rparodi           #+#    #+#             */
-/*   Updated: 2025/09/01 16:39:00 by rparodi          ###   ########.fr       */
+/*   Updated: 2025/09/05 16:14:05 by rparodi          ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
 #include "list.h"
 #include <stdlib.h>
 
-/**
- * @brief Allocate a new list with the first element
- *
- * @param content the element to give on first element
- * @return the new list
- */
 t_list	*ft_lstnew(void *content)
 {
 	t_list	*to_return;