Add missing -o options in ssh(1) manual

[Henri Kemppainen]

A few options appear to be missing from the list in ssh's manual.
The one I didn't add is EnableSSHKeysign, whose description implies
it is only effective when placed in the system-wide config file.

Index: ssh.1
===================================================================
RCS file: /cvs/src/usr.bin/ssh/ssh.1,v
retrieving revision 1.319
diff -u -p -r1.319 ssh.1
--- ssh.1	7 May 2011 23:20:25 -0000	1.319
+++ ssh.1	25 Aug 2011 19:24:29 -0000
@@ -419,11 +419,13 @@ For full details of the options listed b
 .It ConnectTimeout
 .It ControlMaster
 .It ControlPath
+.It ControlPersist
 .It DynamicForward
 .It EscapeChar
 .It ExitOnForwardFailure
 .It ForwardAgent
 .It ForwardX11
+.It ForwardX11Timeout
 .It ForwardX11Trusted
 .It GatewayPorts
 .It GlobalKnownHostsFile
@@ -438,6 +440,7 @@ For full details of the options listed b
 .It IdentityFile
 .It IdentitiesOnly
 .It IPQoS
+.It KbdInteractiveAuthentication
 .It KbdInteractiveDevices
 .It KexAlgorithms
 .It LocalCommand