[SERIAL] Documentation/jsm.txt is a no show.

In kernel bugzilla #5176 (http://bugzilla.kernel.org/show_bug.cgi?id=5176)
Harry R\374ter <[e-mail]> points out Documentation/jsm.txt is missing.

No one at Digi seems to care, so just remove the stale reference.

Signed-off-by: Arthur Othieno <[e-mail]>
Signed-off-by: Russell King <[e-mail]>

drivers/serial/Kconfig

···
 	  something like this to connect more than two modems to your Linux
 	  box, for instance in order to become a dial-in server. This driver
 	  supports PCI boards only.
-	  If you have a card like this, say Y here and read the file
-	  <file:Documentation/jsm.txt>.
+
+	  If you have a card like this, say Y here, otherwise say N.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called jsm.