docs: remove IdleTimeLimit until it is actually implemented

it gives users false hope and finally disappoints them.

docs/man/sesman.ini.5.in

@@ -125,12 +125,6 @@ Sets the maximum number of simultaneous sessions. If not set or set to
 If set to \fB1\fR, \fBtrue\fR or \fByes\fR, every session will be killed
 within 60 seconds after the user disconnects.
 
-.TP
-\fBIdleTimeLimit\fR=\fInumber\fR
-\fI\This option is currently ignored!\fR Time limit before an idle
-session is disconnected. If set to \fI0\fR, automatic disconnection is
-disabled.
-
 .TP
 \fBDisconnectedTimeLimit\fR=\fInumber\fR
 Sets the time limit (in seconds) before a disconnected session is killed.

sesman/sesman.ini

@@ -31,13 +31,6 @@ MaxSessions=50
 ; if 1, true, or yes, kill session after 60 seconds
 KillDisconnected=false
 
-;; IdleTimeLimit - when to disconnect idle sessions
-; Type: integer
-; Default: 0
-; if not zero, the seconds without mouse or keyboard input before disconnect
-; not complete yet
-IdleTimeLimit=0
-
 ;; DisconnectedTimeLimit - when to kill idle sessions
 ; Type: integer
 ; Default: 0