UserGuide: Add ref. to Flyswatter2

Added the Flyswatter2 to section 2.3 USB FT2232 Based hardware
list.

Change-Id: I6a382644b5a0313d30afb5a97d0a9ea00f01efa9
Signed-off-by: Bill Traynor <wmat@alphatroop.com>
Reviewed-on: http://openocd.zylin.com/584
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

doc/openocd.texi

@@ -358,7 +358,7 @@ Evaluation Kits.  Like the non-detachable FT2232 support on the other
 Stellaris eval boards, they can be used to debug other target boards.
 @item @b{olimex-jtag}
 @* See: @url{http://www.olimex.com}
-@item @b{flyswatter}
+@item @b{Flyswatter/Flyswatter2}
 @* See: @url{http://www.tincantools.com}
 @item @b{turtelizer2}
 @* See: