Added Xerox 4800.

unsupported/visioneer-onetouch4800.html

@@ -16,7 +16,8 @@
     <h2>Manufacturer and model</h2>
     <p>
       Visioneer 4800 USB<br>
-      Vantas 3000
+      Vantas 3000<br>
+      Xerox One Touch 4800
     </p>
     <h2>Bus type</h2>
     <p>
@@ -37,7 +38,8 @@
     </p>
     <h2>Comments</h2>
     <p>
-      The Vantas seems to be a clone of the Visioneer scanner.
+      The Vantas and Xerox scanners seem to be clones of the Visioneer scanner
+      (or vice versa).
     </p>
     <p>
       Looks similar to OneTouch <a href="visioneer-onetouch5800.html">5800</a>