pixma: fix some descriptions names

doc/descriptions/pixma.desc

@@ -106,13 +106,13 @@
 :status :complete
 :comment "All resolutions supported (up to 600DPI)."
 
-:model "PIXMA G3000"
+:model "PIXMA G3000 Series"
 :interface "USB WiFi"
 :usbid "0x04a9" "0x1794"
 :status :untested
 :comment "Testers needed!"
 
-:model "PIXMA G4000"
+:model "PIXMA G4000 Series"
 :interface "USB WiFi"
 :usbid "0x04a9" "0x181d"
 :status :untested