Fixed some warnings.

doc/descriptions/mustek.desc

@@ -9,10 +9,11 @@
 ;
 
 :backend "mustek"		; name of backend
-:version "1.0-126"		; version of backend
+:version "1.0-127"		; version of backend
 :status :stable			; :alpha, :beta, :stable, :new
 :manpage "sane-mustek"		; name of manpage (if it exists)
 :url "http://www.meier-geinitz.de/sane/"
+:comment "Most Mustek SCSI scanners are supported by this backend. For USB scanners, look at the mustek_usb backend."
 
 :devicetype :scanner