More documentation inconsistencies

[Igor Korot <ikorot01 gmail com>]

Hi,
In the https://developer.gnome.org/gtk3/stable/GtkFileChooserDialog.html
it stays:

[quote]
first_button_text    stock ID or text to go in the first button, or
NULL.   [allow-none]
[/quote]

However, if I understand correctly stock items are deprecated.

So even though the function is present since 2.4, some notes should be added.

Do you agree?

Thank you.