bug#40671: [DOC] modify literal objects

[Eli Zaretskii]

> Cc: ke.vigouroux@laposte.net, eggert@cs.ucla.edu, 40671@debbugs.gnu.org,
>  michael_heerdegen@web.de, mattiase@acm.org, rms@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 26 Apr 2020 20:39:38 +0300
> 
> int main (void) {
>    return ((int(*) (int))"abc")(1);
> }
> 
> It will blow up at runtime, of course.

But the previous program will not necessarily blow up at runtime.