USB:Update mailing list information in documentation

Signed-off-by: Robert P. J. Day <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

Documentation/usb/usb-help.txt

···
 usb-help.txt
-2000-July-12
+2008-Mar-7
 
 For USB help other than the readme files that are located in
 Documentation/usb/*, see the following:
···
 Linux USB Guide:    http://linux-usb.sourceforge.net
 Linux-USB device overview (working devices and drivers):
                     http://www.qbik.ch/usb/devices/
-    
-The Linux-USB mailing lists are:
-  [e-mail]   for general user help
-  [e-mail]   for developer discussions
+
+The Linux-USB mailing list is at [e-mail]
 
 ###