doc update for LiDE 200 4800 dpi mode

doc/descriptions/genesys.desc

@@ -131,7 +131,7 @@
 :interface "USB"
 :usbid "0x04a9" "0x1905"
 :status :complete
-:comment "GL847 based, resolution from 75 to 2400 dpi"
+:comment "GL847 based, resolution from 75 to 4800 dpi"
 
 :model "CanoScan LiDE 210"
 :interface "USB"

doc/sane-genesys.man

@@ -260,5 +260,6 @@ This backend will be much slower if not using libusb-1.0. So be sure that sane-b
 .br
 
 .SH "BUGS"
-Currently no known bug.
+For the LiDE 200, the scanned data at 4800 dpi is obtained "as is" from sensor. It seems the windows driver does some digital processing
+to improve it, which is not implemented in the backend.
 .PP