document new option for curses driver

LCDd.conf

@@ -218,9 +218,9 @@ Reboot=yes
 # color settings
 # foreground color [default: blue]
 Foreground=blue
-# background color [default: cyan]
+# background color when "backlight" is ff [default: cyan]
 Background=cyan
-# backlight color [default: red]
+# background color when "backlight" is on [default: red]
 Backlight=red
 
 # display size [default: 20x4]
@@ -228,8 +228,11 @@ Size=20x4
 
 # What position (X,Y) to start the left top corner at...
 # Default: (7,7)
-TopLeftx=7
-TopLefty=7
+TopLeftX=7
+TopLeftY=7
+
+# use ASC symbols for icons & bars [default: no; legal, yes, no]
+UseACS=no