staging: comedi: jr3_pci: change module description

Change the MODULE_DESCRIPTION string from the generic "Comedi low-level
driver" to the more specific "Comedi driver for JR3/PCI force sensor
board".

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>