docs: table of all symbols and individual new symbols per release is outdated
If you take a look to the front page, the last release documented with new symbols is 2.12. But since then new API was added.
So for example this: https://developer.gnome.org/atk/2.28/api-index-full.html
Doesn't include the last substring AtkText methods. So it is also missing the individual new symbols for the release it was added, something like this: https://developer.gnome.org/atk/2.28/api-index-2-12.html
Note that although I used as example the substring methods, this issue is a general task about doing a full update with all the new symbols since 2.12.