Remove rsh/rlogin references from security man page

More extensive changes to this page are certainly needed, but at least
remove references to binaries that no longer exist.

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

share/man/man7/security.7

@@ -28,7 +28,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd July 27, 2019
+.Dd August 13, 2019
 .Dt SECURITY 7
 .Os
 .Sh NAME
@@ -99,9 +99,7 @@ pipe.
 A user account compromise is even more common than a DoS attack.
 Many
 sysadmins still run standard
-.Xr telnetd 8 ,
-.Xr rlogind 8 ,
-.Xr rshd 8 ,
+.Xr telnetd 8
 and
 .Xr ftpd 8
 servers on their machines.
@@ -186,8 +184,6 @@ in the
 file
 so that direct root logins via
 .Xr telnet 1
-or
-.Xr rlogin 1
 are disallowed.
 If using
 other login services such as
@@ -342,10 +338,7 @@ virtually every server ever run as root, including basic system servers.
 If you are running a machine through which people only log in via
 .Xr sshd 8
 and never log in via
-.Xr telnetd 8 ,
-.Xr rshd 8 ,
-or
-.Xr rlogind 8 ,
+.Xr telnetd 8
 then turn off those services!
 .Pp
 .Fx
@@ -378,7 +371,7 @@ occur through them.
 The other big potential root hole in a system are the SUID-root and SGID
 binaries installed on the system.
 Most of these binaries, such as
-.Xr rlogin 1 ,
+.Xr su 1 ,
 reside in
 .Pa /bin , /sbin , /usr/bin ,
 or
@@ -905,8 +898,6 @@ if you intend to use them.
 Kerberos5 is an excellent authentication
 protocol but the kerberized
 .Xr telnet 1
-and
-.Xr rlogin 1
 suck rocks.
 There are bugs that make them unsuitable for dealing with binary streams.
 Also, by default