Fix missing options in man pages.

None of them documented -4, -6, -noagent, or -agent.
Ask document 'plink -nc host:port'.

doc/man-pl.but

@@ -133,6 +133,10 @@ tunnel all their connections. Only works in SSH.
 
 \dd Force use of SSH protocol version 2.
 
+\dt \cw{-4}, \cw{-6}
+
+\dd Force use of IPv4 or IPv6 for network connections.
+
 \dt \cw{-C}
 
 \dd Enable SSH compression.
@@ -147,6 +151,16 @@ else's.
 a \e{public} key here (in RFC 4716 or OpenSSH format), to identify
 which of the agent's keys to use. }
 
+\dt \cw{\-noagent}
+
+\dd Don't try to use an authentication agent for local authentication.
+(This doesn't affect agent forwarding.)
+
+\dt \cw{\-agent}
+
+\dd Allow use of an authentication agent. (This option is only necessary
+to override a setting in a saved session.)
+
 \dt \cw{\-hostkey} \e{key}
 
 \dd Specify an acceptable host public key. This option may be specified
@@ -167,6 +181,11 @@ written. }
 
 \dd Don't start a remote command or shell at all (SSH-2 only).
 
+\dt \cw{\-nc} \e{host}:\e{port}
+
+\dd Make a remote network connection from the server instead of
+starting a shell or command.
+
 \dt \cw{\-sercfg} \e{configuration-string}
 
 \dd Specify the configuration parameters for the serial port, in

doc/man-pscp.but

@@ -87,6 +87,10 @@ commands such as \q{\c{w}}).
 
 \dd Force use of SSH protocol version 2.
 
+\dt \cw{-4}, \cw{-6}
+
+\dd Force use of IPv4 or IPv6 for network connections.
+
 \dt \cw{-C}
 
 \dd Enable SSH compression.
@@ -101,6 +105,15 @@ else's.
 a \e{public} key here (in RFC 4716 or OpenSSH format), to identify
 which of the agent's keys to use. }
 
+\dt \cw{\-noagent}
+
+\dd Don't try to use an authentication agent.
+
+\dt \cw{\-agent}
+
+\dd Allow use of an authentication agent. (This option is only necessary
+to override a setting in a saved session.)
+
 \dt \cw{\-hostkey} \e{key}
 
 \dd Specify an acceptable host public key. This option may be specified

doc/man-psft.but

@@ -75,6 +75,10 @@ commands such as \q{\c{w}}).
 
 \dd Force use of SSH protocol version 2.
 
+\dt \cw{-4}, \cw{-6}
+
+\dd Force use of IPv4 or IPv6 for network connections.
+
 \dt \cw{-C}
 
 \dd Enable SSH compression.
@@ -89,6 +93,15 @@ else's.
 a \e{public} key here (in RFC 4716 or OpenSSH format), to identify
 which of the agent's keys to use. }
 
+\dt \cw{\-noagent}
+
+\dd Don't try to use an authentication agent.
+
+\dt \cw{\-agent}
+
+\dd Allow use of an authentication agent. (This option is only necessary
+to override a setting in a saved session.)
+
 \dt \cw{\-hostkey} \e{key}
 
 \dd Specify an acceptable host public key. This option may be specified

doc/man-ptel.but

@@ -173,6 +173,10 @@ configuration box first.
 
 \dd Specify the port to connect to the server on.
 
+\dt \cw{-4}, \cw{-6}
+
+\dd Force use of IPv4 or IPv6 for network connections.
+
 \S{puttytel-manpage-saved-sessions} SAVED SESSIONS
 
 Saved sessions are stored in a \cw{.putty/sessions} subdirectory in

doc/man-putt.but

@@ -231,6 +231,10 @@ pseudo-terminal at the server end.
 
 \dd Select SSH protocol version 1 or 2.
 
+\dt \cw{-4}, \cw{-6}
+
+\dd Force use of IPv4 or IPv6 for network connections.
+
 \dt \cw{\-i} \e{keyfile}
 
 \dd Private key file for user authentication. For SSH-2 keys, this key
@@ -241,6 +245,16 @@ else's.
 a \e{public} key here (in RFC 4716 or OpenSSH format), to identify
 which of the agent's keys to use. }
 
+\dt \cw{\-noagent}
+
+\dd Don't try to use an authentication agent for local authentication.
+(This doesn't affect agent forwarding.)
+
+\dt \cw{\-agent}
+
+\dd Allow use of an authentication agent. (This option is only necessary
+to override a setting in a saved session.)
+
 \dt \cw{\-hostkey} \e{key}
 
 \dd Specify an acceptable host public key. This option may be specified