criu(8): remove -t from synopsys

Either we list all options in synopsys, or none.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Documentation/criu.txt

@@ -11,7 +11,7 @@ criu - checkpoint/restore in userspace
 
 SYNOPSIS
 --------
-*criu* 'command' -t 'pid'
+*criu* 'command' ['options']
 
 DESCRIPTION
 -----------