It is possible to add XEPs version on the page and maybe add new XEPs in the list?
http://download.igniterealtime.org/smack/docs/latest/documentation/extensions/
OMEMO is now XEP-0384 
http://blogs.fsfe.org/vanitasvitae/2018/02/07/more-xeps-for-smack/
http://blogs.fsfe.org/vanitasvitae/2018/01/16/smack-a-busy-week/
http://blogs.fsfe.org/vanitasvitae/2018/01/10/reworking-smack-omemo/
http://blogs.fsfe.org/vanitasvitae/
I think there is a problem with the documentation because the template is not like Openfire : http://download.igniterealtime.org/openfire/docs/latest/documentation/protocol-support.html