[Samba] can windows server 2012 R2 join samba ad directly

[Adam Xu]

Hi samba list,

accroding to samba wiki, 
https://wiki.samba.org/index.php/Joining_a_Windows_Server_2012_/_2012_R2_DC_to_a_Samba_AD

Windows server 2012 R2 can't join to samba AD directly. I need to join a 
windows server 2018 R2 to samba AD first and then join windows server 
2012 R2 to samba AD.

but a searched for a document. 
https://samba.tranquil.it/doc/en/samba_advanced_methods/samba_add_windows_active_directory.html

In that document, we can join windows server 2012 R2 to samba directly.

Which document is more reliable? My samba version is 4.15.6.