iwlwifi: update comments on how to enable debug flag

Modify comments on how to enable and change debug_level
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/Kconfig

@@ -54,13 +54,13 @@ config IWLWIFI_DEBUG
 	  control which debug output is sent to the kernel log by setting the
 	  value in
 
-		/sys/class/net/wlan0/device/debug_level
+		/sys/module/iwlwifi/parameters/debug
 
 	  This entry will only exist if this option is enabled.
 
 	  To set a value, simply echo an 8-byte hex value to the same file:
 
-		  % echo 0x43fff > /sys/class/net/wlan0/device/debug_level
+		  % echo 0x43fff > /sys/module/iwlwifi/parameters/debug
 
 	  You can find the list of debug mask values in:
 		  drivers/net/wireless/iwlwifi/iwl-debug.h

drivers/net/wireless/iwlwifi/iwl-debug.h

@@ -105,10 +105,12 @@ static inline void iwl_dbgfs_unregister(struct iwl_priv *priv)
  *
  * The active debug levels can be accessed via files
  *
- * 	/sys/module/iwlagn/parameters/debug{50}
- * 	/sys/class/net/wlan0/device/debug_level
- *
+ *	/sys/module/iwlwifi/parameters/debug
  * when CONFIG_IWLWIFI_DEBUG=y.
+ *
+ *	/sys/kernel/debug/phy0/iwlwifi/debug/debug_level
+ * when CONFIG_IWLWIFI_DEBUGFS=y.
+ *
  */
 
 /* 0x0000000F - 0x00000001 */