carl9170: angle brackets for wiki link

"The convention seems to be angle brackets around
URLS in Kconfig."
 -- Finn Thain (to update web addresses in the kernel)
Signed-off-by: NChristian Lamparter <chunkeey@googlemail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/carl9170/Kconfig

@@ -10,7 +10,7 @@ config CARL9170
 	  but it needs a special firmware (carl9170-1.fw) to do that.
 
 	  The firmware can be downloaded from our wiki here:
-	  http://wireless.kernel.org/en/users/Drivers/carl9170
+	  <http://wireless.kernel.org/en/users/Drivers/carl9170>
 
 	  If you choose to build a module, it'll be called carl9170.