Bug in Documentation about Samba

[Philipp Gerloff]

Hey Guys, 

thanks for the great work! Keep it up!

I found a bug in the docs:

https://www.freebsd.org/doc/handbook/network-samba.html <https://www.freebsd.org/doc/handbook/network-samba.html>

There is written:
	samba_enable="YES"


But for Samba4 it has to be:
	samba_server_enable="YES"



Regards,
Philipp Gerloff