listbox_XXX function documentation missing parameter

[SamSandq]

Seems like the API documentation is missing a parameter:

now:

const char_t *listbox_text(const *listbox);

should be:

const char_t *listbox_text(const *listbox, uint32 index);

In other words the index of the list item is missing. I believe there are several with the same mistake, but have not checked.

[frang75]

Reviewed listbox documentation page: https://nappgui.com/en/gui/listbox.html
The parameter was missing in several methods.
Thanks for the report.