bug#40671: [DOC] modify literal objects

[Dmitry Gutov]

On 29.04.2020 02:10, Paul Eggert wrote:
> terminology used by C/C++/Fortran

Quote from https://en.cppreference.com/w/cpp/language/cv:

const object - an object whose type is const-qualified, or a non-mutable 
subobject of a const object. Such object _cannot_ be modified: attempt 
to do so directly is a _compile-time error_, and attempt to do so 
indirectly (e.g., by modifying the const object through a reference or 
pointer to non-const type) results in undefined behavior.

Emphasis mine.

I'll take a look at the commit, thanks.