Document -AcceptSetDesktopSize in x0vncserver.man

It now accepts this parameter, so make sure it is documented.
diff --git a/unix/x0vncserver/x0vncserver.man b/unix/x0vncserver/x0vncserver.man
index 5f1508c..5aaf694 100644
--- a/unix/x0vncserver/x0vncserver.man
+++ b/unix/x0vncserver/x0vncserver.man
@@ -187,6 +187,10 @@
 Accept pointer press and release events from clients. Default is on.
 .
 .TP
+.B \-AcceptSetDesktopSize
+Accept requests to resize the size of the desktop. Default is on.
+.
+.TP
 .B \-RemapKeys \fImapping
 Sets up a keyboard mapping.
 .I mapping