usb_modeswitch: more descriptive help text

Provides a fuller description of the USB_ModeSwitch functionality for
the benefit of the otherwise clueless.

[Thomas: minor formatting and wording fixes.]

Signed-off-by: Jonathan Ben-Avraham <yba@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/usb_modeswitch/Config.in

@@ -3,8 +3,19 @@ config BR2_PACKAGE_USB_MODESWITCH
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libusb
 	select BR2_PACKAGE_LIBUSB
 	help
-	  USB mode switcher.
-	  Used to switch mode on multiple-function devices
+	  Some models of some USB devices such as modems and Wifi
+	  adapters power-up in mass storage mode to provide access to
+	  drivers for the device's application mode. usb_modeswitch
+	  changes the mode of such devices from the initial power-up
+	  mode to the application mode. Specific configuration data
+	  for each device model is required.
+
+	  usb_modeswitch can be used with the usb_modeswitch_data
+	  package and udev for automatic mode switching when devices
+	  are connected.
+
+	  For more information search the Internet for "Virtual CD-ROM
+	  switching utility".
 
 	  http://www.draisberghof.de/usb_modeswitch/