Document login's use of /etc/login.access.

Submitted by:	David E. O'Brien

usr.bin/login/login.1

@@ -89,6 +89,13 @@ This is used by
 to prevent users from logging in when the system is about to go down.
 .Pp
 If the file
+.Pa /etc/login.access
+exists,
+.Nm login
+checks to see if the user and host pair are specifically allowed or denied
+access.
+.Pp
+If the file
 .Pa /etc/fbtab
 exists,
 .Nm login
@@ -132,6 +139,8 @@ changes device protections
 message-of-the-day
 .It Pa /etc/nologin
 disallows logins
+.It Pa /etc/login.access
+login access control table
 .It Pa /var/run/utmp
 current logins
 .It Pa /var/log/wtmp
@@ -147,8 +156,10 @@ makes login quieter
 .Xr rlogin 1 ,
 .Xr getpass 3 ,
 .Xr fbtab 5 ,
+.Xr login.access 5 ,
 .Xr utmp 5 ,
 .Xr environ 7
+.Xr nologin 8 ,
 .Sh HISTORY
 A
 .Nm login