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 19:02:05 +0300
> 
> On 26.04.2020 18:46, Eli Zaretskii wrote:
> > I think this shows the difference between CANNOT and SHOULD NOT, wrt
> > constants.
> 
> I'm not sure I understand the analogy.

That program demonstrates that in C one CAN change a "constant"
array.  But one definitely SHOULD NOT do that.