Add Giorgos's description of the ftp-chroot login.conf option.

Reported by:	Bill Moran <wmoran@potentialtech.com>
Submitted by:	keramida
MFC after:	2 weeks

lib/libutil/login.conf.5

@@ -183,6 +183,14 @@ The maximum and current limits may be specified individually by appending a
 value.
 .It "hushlogin	bool	false	Same as having a ~/.hushlogin file.
 .It "ignorenologin	bool	false	Login not prevented by nologin.
+.It "ftp-chroot	bool	false	Limit ftp access with
+.Xr chroot 2
+to the
+.Ev HOME
+directory of the user.
+See
+.Xr ftpd 8
+for details.
 .It "label	string			Default MAC policy; see
 .Xr maclabel 7 .
 .It "lang	string		Set $LANG environment variable to the specified value.
@@ -399,6 +407,7 @@ lists.
 .Sh SEE ALSO
 .Xr cap_mkdb 1 ,
 .Xr login 1 ,
+.Xr chroot 2 ,
 .Xr getcap 3 ,
 .Xr getttyent 3 ,
 .Xr login_cap 3 ,
@@ -406,4 +415,5 @@ lists.
 .Xr pam 3 ,
 .Xr passwd 5 ,
 .Xr ttys 5 ,
+.Xr ftpd 8 ,
 .Xr pam_passwdqc 8