Update snapscan man page

doc/sane-snapscan.man

@@ -8,8 +8,10 @@ The
 library implements a SANE (Scanner Access Now Easy) backend that provides
 access to AGFA SnapScan flatbed scanners. At present, the following scanners
 are supported from this backend: AGFA SnapScan 300, 310, 600, and 1236s,
-1212u, e40, e50, Vuego 310s, Acer 300f, 310s, 610s, 610plus, Prisa 620s, Prisa
-620u, Prisa 640u, Prisa 640bu, Guillemot Maxi Scan A4 Deluxe (SCSI) (with
+1236u, 1212u, e20, e25,
+e40, e50, e60, Vuego 310s, Acer 300f, 310s, 610s, 610plus, Prisa 620s, Prisa
+620u, Prisa 620ut, Prisa 640u, Prisa 640bu, Prisa 1240, Prisa 3300, Prisa
+4300, Prisa 5300 and Guillemot Maxi Scan A4 Deluxe (SCSI) (with
 varying success).
 .PP
 
@@ -22,7 +24,7 @@ This backend expects device names of the form:
 .PP
 Where
 .I special
-is either the path-name for the special device that corresponds to a
+is the path-name for the special device that corresponds to a
 SCSI scanner. For SCSI
 scanners, the special device name must be a generic SCSI device or a
 symlink to such a device.  Under Linux, such a device name could be
@@ -31,7 +33,19 @@ or
 .IR /dev/sge ,
 for example.  See sane-scsi(5) for details.
 .P
-For USB scanners see http://snapscan.sourceforge.net/ for details.
+For USB scanners the devicename must contain the keyword "usb", as in 
+.I /dev/usbscanner 
+or
+.IR /dev/usb/scanner0 .
+For scanners that need a firmware upload before scanning add a line starting
+with "firmware" followed by the fully qualified path to your firmware file,
+e.g.
+.PP
+.RS
+firmware /path/to/my/firmware.bin
+.RE
+.PP
+For further details read http://snapscan.sourceforge.net.
 
 .SH CONFIGURATION
 The contents of the
@@ -90,7 +104,8 @@ http://sourceforge.net/projects/snapscan/ (new development website)
 .SH AUTHOR
 Kevin Charter, Franck Schneider, Michel Roelofs, Emmanuel Blot,
 Mikko Tyolajarvi, David Mosberger-Tang, Wolfgang Goeller,
-Petter Reinholdtsen, Gary Plewa, Sebastien Sable, and Mikael Magnusson.
+Petter Reinholdtsen, Gary Plewa, Sebastien Sable, Oliver Schwartz
+and Mikael Magnusson.
 .br
 Man page by Henning Meier-Geinitz (mostly based on the web pages and 
 source code).