UserGuide: Fixed link to IAR J-Link.

In Section 2.5 USB JLINK based, fixed the URL for IAR J-Link:
http://www.iar.com/en/products/hardware-debug-probes/iar-j-link/

Change-Id: If613d2e915a0a704569d74094e612e34bcc849d3
Signed-off-by: Bill Traynor <wmat@alphatroop.com>
Reviewed-on: http://openocd.zylin.com/586
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

doc/openocd.texi

@@ -408,7 +408,7 @@ AT91SAM764 internally.
 @item @b{SEGGER JLINK}
 @* Link: @url{http://www.segger.com/jlink.html}
 @item @b{IAR J-Link}
-@* Link: @url{http://www.iar.com/website1/1.0.1.0/369/1/index.php}
+@* Link: @url{http://www.iar.com/en/products/hardware-debug-probes/iar-j-link/}
 @end itemize
 
 @section USB RLINK based