ath9k: Fix documentation in rate control

This fix updates the documenation in Rate Control Table structure

Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/rc.c b/drivers/net/wireless/ath/ath9k/rc.c
index 13f9e88..abebf24 100644
--- a/drivers/net/wireless/ath/ath9k/rc.c
+++ b/drivers/net/wireless/ath/ath9k/rc.c
@@ -302,7 +302,7 @@
 		[64] = {  RC_INVALID, WLAN_RC_PHY_HT_40_TS, 243000,
 			205100, 20, 20, 8, 64, 65, 65 }, /* 243 Mb */
 		[65] = {  RC_INVALID, WLAN_RC_PHY_HT_40_TS_HGI, 270000,
-			224700, 20, 20, 8, 64, 65, 65 }, /* 170 Mb */
+			224700, 20, 20, 8, 64, 65, 65 }, /* 270 Mb */
 		[66] = {  RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 324000,
 			263100, 21, 21, 8, 66, 67, 67 }, /* 324 Mb */
 		[67] = {  RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 360000,